In 1953, a contractor built himself a bachelor bunker in Hollywood. The home, as described in an LA Times article, had a swimming pool that was actually "an underwater tunnel leading to a sealed, underground cave aerated with oxygen tanks." See the old-timey rendering above, and read more about the home over at Curbed LA.

Villa Vals, the creation of designers Bjarne Mastenbroek and Christian Müller, is a vacation home burrowed in the hills of Vals, Switzerland. To get to the bunker, visitors must first find the entrance—actually a shed—and creep through the underground tunnel that cuts through the mountains. Bonus: the inside has a slick secret-agent vibe.

Here is the swankiest bunker of them all, Vivos corporation's massive underground shelter in Nebraska. Amenities at the four-star, disaster-ready hotel will include dental facilities, a bakery, a medical center, and even a prison. Here's what's odd: the location of the concrete-and-steel bunker will remain a mystery, even to the paying customers, until disaster occurs. (The address used for this map is that of the Nebraska's Department of Insurance.) Seems like the investors have a lot of faith that Vivos will be able to predict the exact time and place apocalyptic disaster will hit.

Over in China, the world's leader in crazy architecture, a man from Urumqi emptied his savings building a vessel that stands ready for the great flood. Sure, the decrepit-looking boat is missing the sheen of some other Ark-inspired architecture (see: the bobbing Ark Hotel) but this end-of-the-world-ready structure has the advantage of being, well, actually built.

During the Napoleonic wars, the Martello towers served as defensive safeholds. Now? It's still an effective way to fend off attackers, what with its 360-degree views and stone façade, but instead of a military fort, it's a modern family home, transformed by designer Duncan Jackson.

The abode of Don Brown, a wealthy and exceedingly paranoid man who died, oddly enough, in a plane crash, features 20 above-ground concrete pods as well as, of course, some 30,000 square feet of underground real estate. Yep, beneath that fastidiously manicured lawn are such doomsday necessities as a restaurant, a barber shop, and five bars. Brown, who made his fortune by inventing the drop ceiling, apparently also had trained Dobermans do a lap around the estate every hour. Just, you know, to be extra safe.

Much like the luxe underground digs being built in Nebraska, this fancy underground colonnade of condos brags a slew of amenities, including space for hydroponic and aquaculture food production, a library, a classroom, a medical center, and "redundant" water supply and air filtration. Another similarity? The company's keeping its true location under wraps—all they're giving away is that it's in Kansas.

During the Cold War, Sweden's proximity to Russia meant a lot of bomb shelters and doomsday bunkers beneath the icy streets of its cities. For this bunker in Sollentuna, Swedish intelligence brought in an abundance of primary colors meant to bring cheer to a windowless compound, though the result was perhaps more aptly described by Oobject as "Ikea in Hell."