Chocolate, ice, and other strange spots to rest your weary head.

For some hotel designers, building a soft place to rest your head is apparently too easy. They're experimenting with converting prisons into hostels, plopping lux bedrooms into public restrooms, and submerging guest rooms underwater. Below, a collection of some of the most extreme global hotel concepts of the past few years, assembled by Reuters.

A caravan turned into sleeping accommodations is pictured in the indoor camping hotel Huettenpalast in Berlin's Neukoelln district on May 5, 2011. (Tobias Schwarz/Reuters)

A couple are snug inside a sleeping bag at an ice hotel at Alpha Resort Tomamu's ice village in Shimukappu town, Japan's northern island of Hokkaido on February 6, 2008. (Yuriko Nakao/Reuters)

Reporters visit China's largest capsule hotel in Qingdao, Shandong province on January 15, 2013. These 2-by-1 meter, 1.2-meter high capsule rooms are each equipped with an LCD TV, WiFi connection, a computer desk, a dresser, and bedding. (China Daily/Reuters)

Local Manager Gisela Olsson makes a bed in the Jumbo Hostel at Arlanda Airport, Stockholm on January 14, 2009. Jumbo Hostel is a Boeing 747-200 jumbo jet that has been converted into a 25 room hotel and cafe and the cockpit has been converted into a de luxe suite. (Fredrik Sandberg/Reuters)

Chanel designer Karl Lagerfeld poses as he unveils his hotel suite creation made of chocolate, part of a campaign for Magnum ice cream, at a hotel in Paris on April 28, 2011. (Jacky Naegelen/Reuters)

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