Located in the heart of Rothenstein, Germany, is this five-star, invitation-only luxury survival bunker designed for billionaires. Said to be the world's largest and safest bunker, private apartments cost £1.8 million ($2.2m) while semi-private suites start at £31,000 ($38k) per person. 

It's the very definition of a hidden home; invisible to the world. It might look like a prison camp from the outside but behind those doors lies an indestructible silo and also some of the most luxurious properties money can buy.

Buying a Vivos shelter is a pretty competitive process and is based on a co-ownership model. To be considered as a co-owner of a shelter, you have to apply to become a Vivos member, where you’ll then be added to a giant pool of members from which somebody will be selected as the 'best candidate' for each shelter.

So just how do you get to a bunker? Members arrive at their own discretion by car or private plane, prior to their lockdown at nearby airports. Vivos helicopters will then be dispatched to fly them to the compound safely and in complete secrecy. 

Pretty impressive, huh? That deceptive little white door is the gateway to a whole other world of secret rooms, as exemplified in this luxury living room for residents. Each family that buys a plot here is given 2,500 square feet of floor area, spread over two floors. 

All shelter areas are hidden behind radiation-proof vehicle entrances, such as this one here, as well as other passages people can access by foot. It really is the ultimate doomsday hideaway! 

Unlike a typical driveway, getting to your luxury abode takes a little time. Each of the three main secret tunnel entrances have an outer door and a second set of steel doors that well and truly keep you locked in and protected from any potential unwanted chemicals. 

Better still, Vivos Europa One comes equipped with this beautiful swimming pool. Could there be any better way to swim than safe in the knowledge that you’re in a building able to withstand earthquakes, tsunamis and pandemics?

The bunker also offers protection for historical artefacts, animals, DNA and seeds, acting like a Noah's Ark to help re-propagate the Earth after the apocalypse.

The end of the world is likely to be quite stressful, so your new luxury home has a number of features to help you forget about your troubles and relax. This amazing aquarium fit for a millionaire should do the trick, even though it's more likely to be a video than the real thing.