United Kingdom's Go Below offers adventure-packed cave tours in North Wales. But what made the company world famous is the unique accommodation set 1,375 feet (419 meters) below the ground level in an abandoned Victorian slate mine. Snowdonia's disused slate (a type of rock commonly used in construction) mines are …

The salt mine in Wieliczka is a significant tourist attraction and is visited yearly by over a million people. Operation of the mine ceased in 1996, after over 750 years of continuous operation. It's one of Europe's oldest salt mines and consists of a labyrinth of tunnels of over 124 …

The ultimate hidden villa is tucked away under the snow-capped mountains in the green meadows of the Swiss village of Vals. This house is carved into the mountainside in a flawless design to leave the natural surroundings unharmed. Villa Vals can accommodate up to ten people and is set within …

Forget about simply visiting the Swiss Alps; now, you can stay in a former army fortress nestled within the mountain's rocky face. La Claustra in Switzerland is a treasure trove of discovery and uniqueness extended over an area of 43,056 square feet (4,000 square meters). Here you will find an …

Lounge on your luxury leather chair underneath a delicate chandelier that hangs from the roof of a room that has been tunneled out of a pure rock, 509 feet (155 meters) below the surface. As if you were Gollum from Lord of the Rings. Except for the massively wealthy and …

Coober Pedy is a small mining town in the Australian Outback. Because of the extreme temperatures (40ºC in summer), many inhabitants live in underground houses called ‘dugouts’. In fact, the name, ‘Coober Pedy’ comes from the Aboriginal name for the town, ‘kupa-piti’ which means 'white man's hole'. The area has …

The Null Stern is a concept hotel by artistic entrepreneur brothers Frank and Patrik Riklin - ‘Null Stern’ means ‘no stars’. The original project ran for one year, from 2009 to 2010, before being turned into a museum. And in 2022, it was revived as an open space concept, called …