Located in the heart of Rothenstein, Germany, is this five-star, members-only luxury survival bunker designed for billionaires. Said to be the world's largest and safest bunker, private apartments cost £1.7 million ($2.2m) that's €2 million in the local currency for a property in 'shell condition' with utilities.

It'll cost extra to make it habitable and each family is expected to hire their own architect and contractor to build out their dream bunker in style. Meanwhile, semi-private suites shared between four people start at £30,000 ($38.2k) per person or €35,000 in the local currency.

Inside the secret bunker where only billionaires can afford to live