There are a number of places tourists are forbidden to enter. However, there are some whose conditions are so intriguing that the more restrictions are given to tourists, the more they yearn to visit and enjoy the secrets these places can offer.

Number 3: Svalbard Seed Vault, Norway

Located on the Norwegian Island of Spitsbergen slightly more than a thousand kilometers from the North Pole, is a vault believed to have the ability to save mankind in the event of a disaster. It houses more than 10,000 frozen seed samples from roughly 300 species of plants.

The aim of the Svalbard Vault is to provide seeds as 'backup' in the event of a major catastrophe or worldwide death of vegetation. One of the forbidden places in the world, the vault is restricted to everyone even to researchers and experts. According to a report from CNN, it has been opened up for the first and only time in desperate attempts to revive vegetation in conflict-stricken Syria.

Number 2: Area 51, Nevada, USA

A report from Express UK has listed down Area 51 in Nevada, USA as one of the forbidden places in the world. Home to the most controversial stories, both locals and foreigners believe that the US government has cordoned off this place to protect proof of extra-terrestrial existence. Any reason behind the area's seclusion is still unknown.

Number 1: North Sentinel Island, Andaman Islands

One of the most interesting and intriguing forbidden places in the world would be North Sentinel Islands found in the Bay of Bengal. It is home to what is believed to be the last pre-neolithic tribe in the world called the Sentinelese. Their tribe has been isolated from the world for more than 60,000 years. Their numbers are quite unknown and scientists have estimated them to be between 50 and 300.

One of the reasons why the island is so isolated because they tend to be quite ferocious against foreign travelers. Boats and helicopters are reported to be showered by arrows. According to a report from the Telegraph, two men who are found fishing illegally near the area had been held hostage and killed by the Sentinelese in 2006.

The Indian government has tried their best to establish a relationship with the tribe but has miserably failed, forcing them to leave the island in seclusion, based on a report by Forbes.