This highly classified United States Air Force facility is known for conspiracy theories and secret military testing.
This remote island is home to the Sentinelese tribe, one of the last uncontacted tribes in the world.
Public access is restricted due to its critical importance in preserving agricultural biodiversity.
The Vatican Secret Archives hold an extensive collection of documents spanning centuries of Catholic Church history.
Due to the danger posed by the snakes, public access to the island is prohibited.
Situated in the Venetian Lagoon, Poveglia Island has a dark history and is rumored to be haunted.
This secretive underground facility serves as a backup command center for the U.S. government during national emergencies.
Room 39 is a secretive organization in North Korea that is believed to be involved in illegal activities and financing the country's leadership.
Believed to be a secret nuclear missile base, it is off-limits to foreigners and requires special permits for Russians to enter.
It is part of the Heard and McDonald Islands Marine Reserve and is strictly protected, allowing only scientific research visits