Ice Hotel, Jukkasjärvi, Sweden

All of the ice hotels are reconstructed every year, and are dependent upon constant sub-freezing temperatures during construction and operation. The walls, fixtures, and fittings are made entirely of ice or compacted snow, and are held together using a substance known as snice, which takes the place of mortar in a traditional brick-built hotel.
Sweden
Existing each year between December and April, the Icehotel in the village of Jukkasjärvi, about 17 km from Kiruna, Sweden was the world's first ice hotel. In 1989, Japanese ice artists visited the area and created an exhibition of ice art. In spring 1990, French artist Jannot Derid held an exhibition in a cylinder-shaped igloo in the area. One night there were no rooms available in the town, so some of the visitors asked for permission to spend the night in the exhibition hall. They slept in sleeping bags on top of reindeer skin – the first guests of the "hotel."