All hotels

A floating, ring-shaped spa hotel that drifts on the Lule River in summer and freezes into the ice in winter. Cold plunges, wood-fired saunas and land or water cabins surrounded by Arctic forest.

Architect-designed treerooms suspended high in the pine forest above Harads — including the famous Mirrorcube. Northern lights in winter, midnight sun in summer.

The original ice hotel, rebuilt every winter from crystal-clear ice harvested from the Torne River. Sleep on a bed of ice under reindeer hides, 200 km north of the Arctic Circle.

A renovated 1900s sheep farm turned all-inclusive lodge in northern Iceland. Heli-skiing, sea-kayaking and salmon fishing by day; geothermal pool, spa and chef's tasting menu by night.

A hush-hush, hilltop retreat of hand-built log cabins with grass roofs overlooking the Storfjord, an hour from Ålesund. Wood-burning stoves, Nordic spa and serious quiet.

Sleep beneath the northern lights in a thermal-glass igloo deep in the Finnish wilderness. Smoke saunas, husky safaris and snowshoe trails across Urho Kekkonen National Park.