Furthermore, there’s a 22-ton blast-proof door on the vault. ALL visitors are forbidden from entering.

#7 Svalbard Seed Vault, Arctic Svalbard Archipelago

Deep inside a mountain on a remote island in the Svalbard archipelago, halfway between mainland Norway and the North Pole, lies the Global Seed Vault. Even countries that lend seeds aren’t allowed to enter. On a positive note, if an environmental disaster ever occurs, there are plenty of seeds being kept safe to reforest the planet.