6. The Ice Hotel, Sweden

　　 

Thermal long johns are recommended for a stay at the Ice Hotel in Jukkasjärvi where winter temperatures never rise above freezing -- and can drop to minus 35C.

As well as 59 bedrooms, there is a cinema, a sauna, an art gallery, a chapel and an uber-cool vodka bar. And sleeping on a mattress of ice is less chilly than you might think, since the beds are covered with reindeer hides and guests are kitted out with super-warm sleeping bags.

Rates: From SEK 1150 (US$200) per person per night for a double room