Ice Hotel, Finland and Québec
Yes, they're hotels, not campgrounds. And they feature amenities like hot tubs, dance floors and bars. But you can only sleep there in the winter, they're crafted from ice and snow, and you sleep in a sleeping bag with your clothes on. If you think that's a snap, well, then you obviously haven't tried it yet.
The original Ice Hotel opened in Sweden in 1989. The "hotel" was only a 197-square-foot (60-meter) igloo back then; now it's the world's largest hotel crafted from snow and ice at about 18,045 square feet (5,500 meters). Hotel beds are blocks of ice set into wooden bases, then covered with mattresses topped with reindeer skins. Guests sleep in sleeping bags placed on top. If you make it through the night, a guide will awaken you at 7:30 a.m. for some hot lingonberry juice before you hop in the sauna [source: Ice Hotel].
At the Hôtel de Glace just outside of Québec City, you can stay in one of 36 rooms and theme suites, from small, plain rooms with just a bed and nightstand -- the closest to true winter camping -- to premium deluxe suites equipped with a fireplace and private spa [source: Hôtel de Glace].