Guess what city - or even what continent - the geography game GeoGuessr has dropped you into using nothing more than images from Google Maps.

From the remains of Cleopatra's castle to the lost graves of towns inhabited a mere fifty years ago, these submerged wonders hide ruins under seas and rivers.

These seven secret architectural wonders house weapons facilities, bunkers, anonymous societies and dazzling temples in hidden spaces just out of sight.

The Sleeping Around hotel is made from six reclaimed shipping containers, and can go nearly anywhere travelers like, from river banks to busy cities.

These 7 destroyed wonders of recent architectural history once served as powerful symbols or landmarks, but were taken down by fire, war and other misfortunes.

The Alila Villas in Bali blend modern and traditional architectural elements in a resort made of locally sourced materials, honoring the natural setting.

Screaming mummies, suspected vampires, headless vikings and human bones turned into household tools are among the 15 most fascinating archaeological finds.

Tired of searching for a hotel when you get to a new city? This room travels with you, opening up from a suitcase into a fully functional sleeping space.

Tensile treehouse shelters take extreme camping further, allowing you to loft a portable residence amid any forest, above water, mud, sand or sheer void.

You may have seen some strange and unique accommodations, but few hosts can boast something as unusual as this unreal room-free resort in Sweden.