Do you know about the island that's off-limits because of its deadly snake population? Or the impenetrable vault that supposedly holds the secret Coca-Cola recipe? This episode of The List Show is all about Forbidden Places that humans are strictly barred from visiting. Some are forbidden to protect secrets, and others are forbidden to protect humans from an unseemly fate.
Erin (@erincmccarthy) is here to help you explore all the places in the world that you can't explore in person. If you've ever wondered how close you can get to the Chernobyl reactor site, you're in the right place.
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2025 Mental Floss
18 Forbidden Places | Mental Floss
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0:00
Did you know there's an island off the coast of Brazil that's overrun by snakes
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Hi I'm Erin McCarthy, editor-in-chief of MentalFloss.com, and welcome to the List Show
0:07
from my living room. Isla de Camada Grande, or Snake Island, is home to a rare and incredibly deadly species
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of snake called the Golden Lancehead. According to some estimates, there are 1 to 5 snakes for every square meter of land on
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the 43 hectare island. That said, a population survey of the area indicated that those numbers are probably an
0:25
exaggeration, but even so there are definitely a lot of snakes on the island
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The vipers mainly eat the migratory birds that visit the island, and they've evolved
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a venomous bite strong enough to take down their prey before they can fly away. The snakes
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are so dangerous that the Brazilian government has forbidden people from visiting the area
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Rare exceptions are made, mostly for scientists studying the species, but they have to be
0:47
accompanied by a doctor, just in case. And that's just one of the many dangerous, mysterious, or otherwise forbidden places
0:54
that I'll be sharing with you today. Though not many people are eager to go to Snake Island, you may be sad to hear that you
1:07
can't visit Liscaux Cave in France. Discovered in 1940, the cavern contained some of the most iconic cave paintings ever studied
1:14
The sketches of horses, deer, and other animals date back to the Upper Paleolithic Period
1:19
15,000 to 17,000 years ago. The cave opened to the public in 1948 and closed permanently after just 15 years. The
1:27
artificial lights installed there had been promoting algae growth on the cave walls and causing the painting's colors to fade. The microbes humans brought in with them apparently
1:34
weren't helping either. Lascaux Cave is now off limits to visitors, but archaeology fans
1:38
can check out a perfect replica of the site located next door. Another spot that makes the list of coolest places you can't visit is the Issi Grand
1:45
Shrine in Japan. The first iteration of the Shinto Shrine was constructed around 2000 years
1:50
ago, and since the late 7th century it's been torn down and rebuilt every two decades
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This tradition symbolizes the Shinto concepts of death and rebirth, but it has practical
2:00
purposes as well. Reconstructing the shrine about once a generation helps keep the traditional
2:05
Shinbei-zukuri architectural style alive. Wood also has a shorter lifespan than most
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building materials, so demolishing the shrine before it can rot is a way to beat nature
2:13
at its own game. When Issei-grande is rebuilt, every detail of the ornate design has to be
2:18
replicated, making it one of the most expensive structures in the country
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Reconstructing Ise Grand and its hundreds of secondary shrines cost the Japanese government
2:26
$500 million each time. Most of that cost and effort ends up going unseen. While tourists
2:32
can view it from the outside, the inside of the shrine is only accessible to the highest
2:36
priestesses or priests. Even if you were allowed inside, this next forbidden place would be hard to get to. The
2:42
Svalbard Global Seed Vault is located on the remote Arctic island of Spitsbergen in Norway
2:47
The 11,000 square foot space houses more than 1 million seed samples native to places around
2:51
the world. The vault acts as a sort of backup drive of the world's crops, preserving specimens
2:56
in a safe place in case a disaster ever wipes them out in their natural environment. The
3:01
facility is built to protect its contents from unwanted visitors along with everything
3:04
else It deep enough underground and high enough above sea level to withstand earthquakes ocean rise and nuclear attacks In Atlanta Georgia there a high vault that would be much less useful in a
3:15
doomsday scenario. The World of Coca-Cola Museum is the site of a multi-million dollar vault that's said
3:20
to safeguard Coke's secret formula. Tourists can see it from the outside, but the interior is strictly limited to top executives
3:27
Though the vault itself is likely a publicity stunt, the formula is apparently a real, hand-written
3:32
recipe that's been in the company's possession since at least the 1920s. It sat in a safety
3:37
deposit box at an Atlanta bank for decades before moving to its current home at the World
3:41
of Coca-Cola in 2011. Despite all that trouble, Coke's secret formula may not be much of a
3:45
secret at all. That same year, this American life shared a recipe for Coke that had allegedly
3:50
been passed down from a mysterious pharmacist. Coca-Cola, of course, denies that this formula
3:55
is the same one they have locked away. Millions of people visit the Vatican in Rome each year
3:59
but there's at least one area in the tiny sovereign state that's strictly off-limits
4:04
Established in 1612, the Vatican Apostolic Archive, formerly the Vatican Secret Archives
4:09
which sounds way cooler, contains the personal documents of all the popes
4:13
The archives were completely classified until 1881, when Pope Leo XIII gave Catholic scholars special access to the materials
4:21
Today, the collection remains closed to everyone but certain accredited scholars. Researchers who are allowed inside can request up to five files a day
4:28
but they have to know exactly what they want because browsing is forbidden. Who knows what
4:32
we'd find out if they let Tom Hanks run loose in there for a few hours. One of the world's most famous forbidden places has only been forbidden for less than a year
4:39
In October 2019, Uluru, or the Australian landmark formerly known as Ayers Rock, closed to the public
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Climbers have been trekking to the outback for decades just to scale the iconic rock formation
4:50
But long before it was a tourist attraction, Uluru was a sacred place to local indigenous groups
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Following petitions from the Anangu people, the board of the Uluru-Karaj-Shurtar National
5:00
Park finally announced plans in 2017 to ban hikers from the site for good. To be clear
5:05
you can still visit the area, it's just climbing the rock that's forbidden. In case that isn't
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enough to keep people away, there are also rumors of a curse that targets disrespectful
5:13
visitors. Visitors who have collected rocks from Uluru have reported streaks of bad luck
5:19
and enough of the cursed keepsakes have been mailed back to park rangers to earn them the nickname Sorry Rocks
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A lot of forbidden places on this list are ancient, but this next one has only been around
5:27
for a few decades. In the 1960s, an undersea volcanic eruption created a brand new island off the coast of Iceland
5:34
It's not every day that scientists get to study an island from the moment it's born, so they decided to make the most of the opportunity
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The island, named Surtse, has become a case study for how ecosystems develop without any
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interference from humans, other than the ideally non-interventionist scientists who study the
5:49
island, that is. Some of the lifeforms that have found their way to Surtze include molds, fungi, at least
5:54
89 bird species, and supposedly one plucky tomato plant. In 1969, an Icelandic scientist was asked to make a trip to Surtze to identify a mysterious plant
6:04
He arrived and recognized it as a tomato. The scientist, August Bjarneisen, looked into the situation a bit further, as he later recalled
6:11
quote someone had done their business and this beautiful tomato plant had grown out of the feces Fun fact we learned in the course of looking into this story In Iceland a euphemism for going number two which Bjarnason used in relating his tale can be roughly translated
6:25
as playing chess with the Pope. Do with that what you will
6:29
Some islands are off limits for the public's own good. Heard Island in Antarctica is an
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Australian territory, and it's one of the more dangerous places on Earth. A 9,000-foot-tall
6:38
volcano on the island named Måsen Peak has been active since at least 2000, and wind speeds
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there average around 20 miles per hour. While you could apply for a permit to visit the
6:48
island, getting there wouldn't be easy. Heard Island is at least a two-weeks journey by boat from Australia
6:53
Thankfully, no one was around when Mawson Peak became active, but that wasn't the case
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on the Caribbean island of Montserrat in the 1990s. When the Soufrère Hills volcano woke
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up from dormancy in 1995, the nearby town of Plymouth was evacuated and eventually abandoned
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altogether as eruptions continued. Ash consumed the town, turning it into a modern-day Pompeii
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While the volcano is not as destructive as it was a few decades ago, there's a chance
7:17
it could erupt again, which means more than half of the island is still a designated exclusion zone
7:23
I can't mention exclusion zones without talking about Chernobyl. Following the meltdown at the Chernobyl nuclear power plant in Ukraine in 1986, an 18-mile
7:31
radius exclusion zone was established around the site. Though it's still against the law to live there, you can take a day trip with a licensed guide
7:39
Most of the exclusion zone is now open to tourists, including the infamous Reactor 4
7:43
control room where the disaster took place. You'll need a hazmat suit to enter the control room, but you can get away with long-sleeved
7:49
clothing outside the power plant. Area 51 is famously off-limits to the public
7:54
The government refused to acknowledge its existence until 2013, when they finally admitted
7:58
that there was indeed a flight testing facility in the Nevada desert
8:03
Its restricted access didn't stop people from planning a raid on Area 51 in September 2019
8:08
Though more than 2 million people RSVP'd to the Storm Area 51 event on Facebook, only
8:12
a few dozen showed up at the gates at the appointed time, which is extremely relatable
8:16
for anyone who created a birthday party Facebook event in the mid-aughts
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You're maybe attending, Donna? You live two minutes from my house and I know you don't have anything better to do
8:25
Anyway, would-be stormers were quickly forced to leave by authorities, meaning the truth
8:29
is still out there. North Korea's version of Area 51 is Room 39, but instead of military secrets, it's
8:37
said to hide things like black market Viagra. The name refers to the secret department as
8:41
a whole, but it's also believed to be the name of a real office in the Workers' Party
8:45
building in the North Korean capital of Pyongyang. According to some defectors, it keeps foreign
8:50
cash flowing into the pockets of elite officials. Illegal activities coming out of Room 39
8:55
such as counterfeiting, insurance scams, and drug production, along with some legal endeavors
9:00
are estimated to make the country between $500 million and $2 billion in U.S. dollars
9:05
a year. Of course, the country's notorious secrecy makes all of this hard to confirm
9:10
Poveglia in Italy is deserted today. But it's said that over the years, 160,000 people have
9:16
lived and died there. The Venetian island became a quarantine station in 1793, and for
9:22
two decades it was a place for potential victims of the bubonic plague So many people died there that up to 50 of the island soil is said to contain human remains The quarantine station closed in 1814 but Pavelia dark history
9:34
didn't end there. A mental hospital opened at the site in the 1920s, and it quickly developed
9:39
a reputation for its inhumane treatment of patients. The hospital closed after a few
9:43
decades, and today the overgrown island is largely closed off to visitors, except for
9:48
the occasional ghost hunters. New York City is also home to an abandoned quarantine island
9:52
In the late 19th century, North Brother Island on the East River became the site of a hospital
9:56
for patients with contagious diseases. Its most famous patient was Typhoid Mary, America's first known asymptomatic carrier
10:02
of the bacterium responsible for typhoid fever. Mary Mallon unknowingly got dozens of people sick while working as a cook in the early 1900s
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She spent three years quarantined on North Brother Island after the first outbreak she caused, and when she was eventually released, she went back to cooking and infected even
10:18
more people. was sent back to the hospital against her will in 1915 and lived there until her death
10:23
in 1938. The deserted island now serves a much happier purpose as a bird sanctuary
10:29
It's inaccessible to the general public, but the city does make some exceptions for visitors with quote, compelling academic and scientific reasons to visit
10:37
Heart Reef, which is part of Australia's Great Barrier Reef, is a serious candidate
10:41
for world's most photogenic location. As the name suggests, the reef is shaped like
10:45
a heart, and it's been the subject of countless Instagram posts and tourism campaigns. It
10:49
It may be iconic, but you can't actually see the landmark up close. Divers and snorkelers
10:53
have been banned from the spot to protect it from damage. So if you want to snap that perfect vacation pic without hurting a delicate ecosystem, you'll need to pay for a helicopter ride
11:02
Maya Bay in Thailand was also shut down to protect its environment from visitors, but
11:06
the closure is only temporary. Following the release of the Leonardo DiCaprio movie The
11:10
Beach in 2000, Maya Bay exploded into a massive tourist destination. The beach was attracting
11:16
millions of people a year at its peak, which wiped out a lot of the coral native to the area
11:22
Thailand made the decision to close Maya Beach in June 2018 to give the ecosystem a chance
11:25
to recover. The plan is to reopen the beach with tighter restrictions at some point, but as of now
11:31
it remains a forbidden destination. And finally, Ethiopia claims that it's home to the Ark of the Covenant
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It's kept in a church in the city of Aksum that's so closely guarded, even Indiana Jones
11:41
would have trouble getting in. According to legend, the monks who guard the treasure have been trained to kill with their
11:47
bare hands. By some accounts, only the monk who is designated as guardian is able to see
11:52
the Ark, and after assuming his role, he isn't allowed to leave the church grounds for the
11:56
remainder of his life. The secrecy and potential myth-making means that archaeologists haven't
12:01
been able to confirm the Ark's legitimacy. A British historian who claimed to have seen
12:05
it during World War II said that it's actually a medieval-era replica
12:08
Our next episode is all about facts related to conspiracy theories. What could go wrong
12:13
wrong, right? In all seriousness, we want to discuss objectively verifiable information
12:18
about the phenomenon of the conspiracy theory. How do they start, why do they spread, and
12:23
which ones have turned out to be true? If you have a rational, evidence-based fact to
12:27
share, preferably one that avoids the words lizard people, let us know in the comments
12:32
Remember to subscribe, hit the little bell, and come back to Mental Floss on YouTube every
12:36
Wednesday for new videos. We'll see you then
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