the Sala Silver Mine in SwedenIn the next few years, extreme travelers could spend the night floating around in a space hotel. For now, what the Earth can offer will have to suffice. Thankfully, some options have the potential to satiate even the most adventurous — take for example the deepest underground hotel suite in the world. Located in the old, 15th century Sala Silvermine in Sweden, the suite lies 509 ft. deep under the earth's surface.The tunnels of Sala's mine were used to excavate for silver until 1908. Now, it houses a museum, a theater, two ornate dining rooms, and a hotel suite where two people can spend the night. Guests are first toured around the underground facilities so they know their way around, but ultimately left alone overnight — attendants stay on ground level. If you're hit by the call of nature in the middle of the night, you'd have to go up to 165 ft. to access the nearest toilet; no bathroom exists within the mine. Phones, of course, do not work that deep underground.
Clearly, if you're claustrophobic, agoraphobic, or if you really just can't stand gloomy places, this hotel is not for you. But if you fancy a stay underground for whatever purpose you might have, you can spend a night in Sweden's Sala Silvermine suite for $580.