Immerse yourself in a remarkable underground adventure! Discover the most unique and unusual holiday ideas around the world. Start planning your next adventure!
Felsenhotel La Claustra
Spend a night in this restored underground army fortress in the middle of the Swiss Alps under the Gotthard Pass.
Adventure Caving Tour in Budapest
Explore Budapest's extensive cave system with this exhilarating caving adventure in the Danube-Ipoly National Park.
Wieliczka Salt Mine
Explore the underground labyrinth of the Wieliczka Salt Mines on a day trip from Krakow.
The Lookout Cave Underground Motel
Spend a night in this underground motel in Australia, a truly unusual hotel experience.
Buda Castle Caves Walking Tour
Explore the fascinating cave system under the Buda in Budapest.