#3 – The Doomsday Seed Vault
The Doomsday Seed Vault has been designed not to store gold or money but instead holds a wide variety of plant seeds. The idea is that in the event of a natural or man made disaster humanity can preserve crop diversity and always generate a source of food no matter what happens. To try and increase the chances of survival the compound is located in one of the remotest places on the planet – a desolate rock island in the Arctic Circle, with the vault is situated inside an old copper mine. On top of the remote location the seed safe is armed with with blast-proof doors, motion sensors, airlocks, and one meter thick steel reinforced concrete walls.