No! You can’t visit these places

The world might be your oyster but there are some places, in different corners of the world, which you will never be allowed to see. Maybe because these places are too dangerous, too protected, or maybe too special to visit!

Here's a list to such places:

Area 51
Located 83 miles north of Las Vegas in Nevada, Area 51 is classified as a US military installation. While the primary purpose of Area 51 is publicly unknown, some speculate, on the basis of historical evidence, that Area 51 supports the development and testing of experimental aircraft and weapon systems.

The folklore about the secret base has already been going on for decades and the US government's denial about the existence has fuelled the imaginations of conspiracy theorists, some of them relating to extraterrestrial life.

Also referred to as Homey Airport, Groom Lake, Dreamland, Paradise Ranch, Home Base and Watertown, the perimeter of the base is covered with ground sensors and listening devices to detect even the smallest intrusion.

Svalbard Global Seed Vault
The Svalbard Global Seed Vault in Norway can withstand any natural calamity or any type of explosion, apparently contains multiple thousand seeds of every single type of plant all over the world. If there's ever an apocalypse, these seeds can be used to regrow the plants and provide almost the entire human population (or what’s left of it after the disaster) with food.

North Sentinel Island
Approximately as big as Manhattan, North Sentinel Island is one of the most isolated places on earth and home to the most dangerous tribe in the world, Sentinelese tribe.

The isolated tribe has rejected contact from the outside for centuries and remained hostile toward outsiders. In 2006, the tribe murdered two fishermen who had illegally approached the island. The Sentinelese people are very hostile to external contact and because of this, the island has been dubbed as one the hardest places to visit in the world.

Vatican Secret Rooms
One-eighth the size of New York’s Central Park, the Vatican City, with its heavenly structures and extravagantly brightened corridors, is not as accessible as you may think.

Vatican Secret Archives is one such place in the Vatican where only a few can enter. Some believe it houses evidence of extraterrestrial life. Others say it has ancient texts that disproves the existence of Jesus. Whatever the secret library houses is perhaps dark, very dark.

Metro 2
It is believed that Stalin's extreme paranoia led to the construction of Moscow's infamous "Metro-2", an extensive underground tunnel network. Some believe it was constructed to evacuate high-ranking officers in the event of a nuclear war. Others say that it is meant to connect the Kremlin to the FSB (Federal Security Service) headquarters.

Due to Napoleon and Hitler’s near success in taking Moscow, along with the threat of nuclear arsenal from the US during the Cold War, you can hardly blame Stalin for wanting some means of survival in the event of war.

Jianhu National Security Leading Group Office
This museum, dedicated to the history of Chinese espionage, is so guarded that foreigners are banned. A sign outside the Jiangsu National Security Education Museum in a park in the eastern city of Nanjing explicitly states that only Chinese citizens are allowed inside the museum, which houses highly sensitive spy information. "We don't want such sensitive spy information to be exposed to foreigners, so they are not allowed to enter," a spokeswoman for the museum stated.

Surtsey
A relatively new island, Surtsey was formed by a volcanic eruption in 1963, and since then, only a handful of scientists are permitted to set foot on the island. Free from human interference, the site is considered as a living laboratory to study ecological succession. In layman language, it is a site where scientists and researchers analyse how plants and animals establish a presence on new land masses without any human intervention.

Snake Island
Off the coast of Brazil sits Ilha de Queimada Grande, or as it’s popularly known, Snake Island. Scientists have estimated that up to 4,000 snakes live on the 110-acre island, which means you can find one snake for every six square yards. And mind you, these aren't just ordinary snakes.

Snake Island is the only known home of the golden lancehead, one of the most venomous vipers in the world. Because of snake presence all over the island, travelling to this island is forbidden by the Brazilian navy.