Sheldon Chalet, Alaska

Time spent at Sheldon Chalet in Alaska is an experience once reserved only for the hardiest mountaineers. You’ll feel the tingling intimidation of being a human speck in an astounding, glacial wilderness… but come back each night to cosy luxury. And a helicopter there and back – the only transport – just adds to the surreal atmosphere.

The Retreat, Blue Lagoon Iceland

In Iceland, the locals started noticing the amazing effects geothermal seawater – naturally harvested for domestic water heating – had on their bodies in the early 1980s. The stuff in it is pretty wonderful for you, scientists had concluded by 1995, and today this calming destination lets you benefit in the most exclusive of environments.