Most of the planet is open to anyone with a passport and a ticket, yet a handful of places stay shut to almost everyone. They are closed for very different reasons: some guard seeds or ancient paintings, some protect a fragile ecosystem or an isolated people, some hide military work, and some are simply private property with strict rules. Below are nine of the best-known examples, why each one restricts entry, who can still get in, and where the popular stories go further than the facts.
Why a place ends up off-limits
"Forbidden" sounds dramatic, but in practice access is limited for a short list of reasons. Scientists may need an untouched site to study. Conservation law may protect a species that lives nowhere else. Governments may hide defence installations. And some collections are private, opened only to qualified visitors who apply in advance.
It also helps to separate the site from its surroundings. A sealed cave can sit beside a busy museum, and a closed military base can border a highway that tourists drive for fun. Several places on this list have visitor alternatives, which we cover at the end.
Closed to protect science and heritage
Svalbard Global Seed Vault, Norway
Cut into a mountainside near Longyearbyen on the Arctic island of Spitsbergen, the vault opened on 26 February 2008 as a backup for the world's crop genebanks. Its rooms are kept at about −18 °C and can hold 4.5 million seed samples; by mid-2025 it stored more than 1.3 million. Norway owns and maintains the building, the Crop Trust funds day-to-day operations, and the Nordic genebank NordGen runs it. Depositing is free, and only the institution that deposited a sample can take it back out.
That rule is the vault's purpose in action. In 2015, after war disrupted its genebank near Aleppo, the research centre ICARDA withdrew part of its backup to regrow it elsewhere, the first withdrawal in the vault's history. The public cannot tour the seed rooms, although the striking entrance is a familiar photo stop. A 2016 episode of meltwater entering the access tunnel did not reach the seeds, and the tunnel was rebuilt by 2019.
Lascaux Cave, France
Four teenagers found the cave near Montignac in the Dordogne in September 1940, after 18-year-old Marcel Ravidat followed his dog to a hole in the ground. Inside were roughly 6,000 painted and engraved figures, more than 900 of them animals: horses, aurochs, stags and big cats, usually dated to around 17,000 to 22,000 years ago. Lascaux became part of a UNESCO World Heritage listing for the Vézère Valley in 1979.
The cave opened to visitors in 1948, and by the early 1960s about 1,200 people a day were filing through. Their breath, heat and humidity encouraged lichen and fungi on the walls, so the cave was closed in 1963. Later outbreaks of mould in the 2000s showed how delicate it remains. Today only a few specialists enter for short periods each month.
Surtsey, Iceland
Surtsey was born from the sea. An undersea eruption off Iceland's south coast broke the surface on 14 November 1963 and kept building the island until June 1967. Scientists saw an unrepeatable chance to watch life colonise bare new land, so the island has been protected from the start and became a UNESCO World Heritage Site in 2008.
Only a small number of researchers may land, and they check clothes and gear for seeds. The rules are not theoretical: a tomato plant once sprouted from badly disposed human waste and was removed. Since 1965 dozens of plant species, nesting seabirds, seals and many invertebrates have arrived on their own. Erosion has roughly halved the island since 1967, but its harder core may let it survive for centuries rather than decades.
Closed to protect wildlife and people
Ilha da Queimada Grande ("Snake Island"), Brazil
This 43-hectare island lies about 33 km off the coast of São Paulo state. Rising seas after the last ice age cut it off from the mainland, and its snakes evolved into a separate species, the golden lancehead (Bothrops insularis), which hunts migrating birds. The species lives nowhere else and is listed as critically endangered.
Older articles claimed one snake per square metre. The first systematic survey estimated far fewer, roughly 2,000 to 4,000 animals. The island has been a protected area since 1985, and landing is limited to the Brazilian Navy, which services the automated lighthouse, and to researchers approved by Brazil's conservation agency ICMBio. The ban protects the snakes from collectors as much as it protects people from a very venomous bite.
North Sentinel Island, India
North Sentinel, about 60 km² of forest in India's Andaman Islands, is home to the Sentinelese, one of very few peoples who have rejected outside contact. Nobody knows how many live there; estimates range from a few dozen to a few hundred. Indian law, through the Andaman and Nicobar Islands (Protection of Aboriginal Tribes) Regulation of 1956, bans unauthorised approach, and the government keeps a buffer zone around the island and monitors from a distance.
The policy protects both sides. The islanders have little or no immunity to common outside diseases, and they have defended their shore with arrows, including against a helicopter after the 2004 tsunami. Two fishermen who drifted ashore were killed in 2006, and in November 2018 the American missionary John Allen Chau, 26, was killed after paying fishermen to take him close. His body was never recovered. Visits by Indian anthropologists in the early 1990s, led by T. N. Pandit, were peaceful, but they stopped in 1997.
Closed by military secrecy
Area 51, United States
The base on the shore of Groom Lake sits inside the Nevada Test and Training Range, about 83 miles north-northwest of Las Vegas, and is administered as a remote detachment of Edwards Air Force Base. The CIA set it up in 1955 to test the U-2 spy plane, and it later hosted the A-12, the F-117 stealth fighter and other classified programmes. The U.S. government confirmed the site's existence long after the rumours began, and only in 2013 did a released CIA history openly describe the U-2 testing there.
The perimeter is marked with signs warning that deadly force is authorised, and the airspace above is permanently restricted. The alien stories never had evidence behind them; secret aircraft seen at odd angles explain many sightings. Even so, the legend fuels real tourism along Nevada State Route 375, the "Extraterrestrial Highway", and the tiny town of Rachel. A joke online call to "storm Area 51" in 2019 drew millions of sign-ups but only small festivals and a few arrests.
Mezhgorye and Mount Yamantau, Russia
Mezhgorye is a closed town in Bashkortostan, in the southern Urals, at the foot of 1,640-metre Mount Yamantau. It grew from two Soviet military settlements, took its current name in 1995 and had about 17,000 residents in the 2010 census. Like other closed towns, it requires a special permit to enter.
What lies inside the mountain is not publicly known. U.S. officials in the 1990s described large excavations and suspected a bunker complex, while Russian officials offered conflicting explanations, from a mining site to storage. Claims that the base houses automatically triggered nuclear missiles circulate widely online but are unconfirmed; Russia's Cold War "Dead Hand" automatic retaliation system is a separate story, and no public evidence links it to Yamantau.
Closed by law, ownership or legend
Poveglia, Italy
This small island in the Venetian lagoon served from the late 18th century as a quarantine station for ships, and during plague outbreaks sick people were isolated there. In 1922 its buildings became a care home for elderly people, which closed in 1968, after which the island stood empty as state property.
Its "most haunted island" reputation is largely modern. The story of a doctor who performed crude lobotomies and then leapt from the bell tower has no documentary support, and Italian sceptics' group CICAP traces much of the ghost lore to television, especially a 2009 paranormal show. Historian Alberto Toso Fei told the New York Times that about 20 plague deaths are recorded there, not the 100,000 or more of popular retellings. Landing without permission is not allowed. After a 2014 lease auction fell through, a citizens' association, Poveglia per tutti, won a concession in 2025 to turn part of the island into a public lagoon park.
Vatican Apostolic Archive
Pope Paul V ordered the Church's records brought together in 1612, and the collection now fills an estimated 85 km of shelving: papal correspondence, account books, trial records and diplomatic papers. For centuries it was the pope's private archive, which is what the Latin secretum in its old name meant. Pope Leo XIII opened it to scholars in 1881, and in October 2019 Pope Francis renamed it the Vatican Apostolic Archive to drop the misleading word "secret".
It is restricted rather than hidden. Qualified researchers apply for a reader's card, and more than 1,000 consult it each year. Papers from a pontificate usually open about 75 years after it ends, although popes make exceptions; the files of Pius XII (1939–1958) were opened early, in March 2020.
What you can visit instead, and myths to drop
Several of these places have good alternatives. Lascaux IV, a full-scale replica of the whole cave, opened in December 2016 near the original, alongside the older Lascaux II copy. Surtsey can be seen from the air on sightseeing flights, and the Surtsey exhibition on nearby Heimaey explains its science. The Svalbard vault's entrance is easy to photograph from Longyearbyen, and Nevada's Extraterrestrial Highway is a classic road trip that stays legally outside the base. Academic researchers can apply to the Vatican archive.
A few claims are worth retiring:
- "Snake Island has a snake every square metre." Surveys suggest a population in the low thousands across the whole island.
- "Poveglia is filled with the remains of 100,000 plague victims." A Venetian historian puts recorded plague deaths there at around 20.
- "The Vatican's secret archive hides forbidden secrets." "Secret" meant private, and scholars have worked there since 1881.
- "North Sentinel is a sovereign state." It is Indian territory; India simply chooses not to interfere with the islanders.
For another look at places people cannot easily see, read Blurred Google Maps Images: What They Do and Do Not Prove.
Sources: Wikipedia: Svalbard Global Seed Vault; Wikipedia: Lascaux; Wikipedia: Surtsey; Wikipedia: Ilha da Queimada Grande; Wikipedia: North Sentinel Island; Wikipedia: John Allen Chau; Wikipedia: Area 51; Wikipedia: Mezhgorye; Wikipedia: Yamantau; Wikipedia: Poveglia; Wikipedia: Vatican Apostolic Archive; Vatican News, 28 October 2019: Vatican Archives to be renamed.
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