You can find a warm bed ... and four normal walls ... in just about any hotel room. So, if you're looking to defy convention every step of the way, opt for a yurt, treehouse or prison, instead.

Unusual Hotels of the World (the name explains everything) says that you can crash in an igloo anywhere from Finland to Quebec, but be sure to bring a coat. Or, you can climb into bed after climbing into a treehouse. Out 'n' About Treesort in Cave Junction, OR and Winvian (near Litchfield, CT) are on the list.

Closed spaces are accommodated by any number of cave hotels. You can spelunk to the lounge in Turkey and Spain, or you can just go to Parthenon, AR, where the Beckham Creek Cave Haven can be found.

[Via Toronto Sun via Associated Press]

[Photo by Bill Janis]

Filed under: North America, United States, Hotels and Accommodations