Why not stay at the “largest, deepest, darkest, oldest, quietest motel room in the world” or at least in the U.S.? The Grand Canyon Caverns are 200 feet by 400 feet with 70-foot ceilings (there is no chance you will feel claustrophobic), formed more than 65 million years ago, and located 220 feet below the surface. The Underground Cave Suite is $800 per night for two people. It is completely furnished with all amenities one would need – two beds, sofa, kitchenette, bathroom, tables and chairs. The water is hand carried down and up by staff. Possibly the best part of the trip is the chance to explore the caves without the crowds.