Billed as 'the largest billionaire bunker in the world', the Oppidum is located in the Czech countryside. Sprawling over 323,000 square feet, the complex consists of an above-ground level with a golf course, helipad and automatic defense technology, and a cavernous underground shelter.

There's no roughing it in communal bathrooms here as each apartment within the complex has an ensuite luxury bathroom, complete with whirlpool bath, rainfall shower and double sinks.

Luckily, the Oppidum should never run out of booze as it has a generous climate-controlled wine cellar with space for thousands of bottles. In fact, the complex has heaps of storage space, enough for 10 years' worth of food and drink.

There's also a conference and communications room, hospital and dental surgery within the facility. While Zamrazil remains tight-lipped as to who's looking to buy it, it is thought the Oppidum was bought by a single billionaire for an undisclosed price to house family, close friends and staff in the event of a major global catastrophe. 

The top priority for this safe house in Poland was maximum security, which determined the shape of the building. Having been described as the first zombie-proof house it takes the form of a concrete cube where parts of the exterior walls are movable. 

It may not contain a climbing wall or zoo like some of the bunkers we have looked at, however it does have a beautiful swimming pool and luxurious living spaces that open out onto the yard for those precious zombie-free days.

Dubbed 'the world's ultimate Doomsday escape', Vivos Europa One in Rothenstein, Germany is the brainchild of Vivos CEO Robert Vicino, who has built multiple bunkers across the globe, including Vivos xPoint, which is a more affordable option. 

Like the Oppidum, the $1.1 billion Vivos Europa One is a converted former Cold War bunker. Carved out of solid bedrock, the underground shelter is embedded deep within a limestone mountain and can survive a close-range nuclear explosion, a direct airline crash, severe flooding and earthquakes, as well as biological and chemical attacks.

Still under construction, the elite 227,904-square-foot bunker is invitation-only and each privileged invitee is allocated up to 5,000 square feet of living space. As you might expect, at around $5 million a pop, these luxe living 'chambers' don't come cheap.

Future residents are free to customize their living space. The chambers will nod to high-end yacht design and feature lots of marble, polished wood finishes and leather upholstery, and buyers can opt for extravagant home design extras such as private swimming pools, movie theaters and gyms.

Invitees can even opt for a massive aquarium in their bedroom space, filled with stunning tropical fish. Each chamber will also feature deluxe ensuite bathrooms and wetrooms, as well as a gourmet kitchen.

Although arranged in bunks, the beds come with double mattresses and are laid with high-quality 600 thread count sheets. The bedrooms also have closets and abundant storage space, so all you need to bring with you is your clothes, along with any medication.

The state-of-the-art kitchen has everything you'd ever need and is stocked with 60 varieties of food including freeze-dried and canned goods. If you're stuck down here for a while, you won't be without fresh produce either as the bunker has a hydroponic garden that can grow vegetables such as tomatoes and zucchini.

Another room contains high-grade filters that clean incoming air of any nuclear, biological and chemical particles. Places at the bunker start from $35,000 and members already on board include police, security experts, doctors, electricians and chefs. 

Across the pond, the Survival Condo Project has refurbished a former Atlas F nuclear missile silo in rural Kansas and converted the 20,000-square-foot space into luxury subterranean condos and communal areas. The condos start at $1.5 million for a 920-square-foot space stretching half a floor and go up to $4.5 million for a 3,600-square-foot penthouse.

Each condo is fully furnished and the interiors have been created by top designers. Conceived with relaxation and entertainment in mind, the apartments are kitted out with massage chairs, 50-inch LED TVs and virtual windows.

Foodies are well catered to in this survival complex. All condos feature fully equipped kitchens with Kohler sinks and faucets, and high-end stainless steel appliances – ideal for cooking the veggies and fish from the on-site hydroponic and aquaculture farms.

A dedicated library will eventually stock thousands of books that residents can read at their leisure. The complex also houses a classroom for children in the bunker and adults who want to further their education.

While the Survival Condo lacks a bar or nightclub, it does house a roomy movie theater. Handy for canine-loving billionaires who don't want to leave their pooches behind, the complex also boasts its very own dog park.

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