World’s biggest ice cave – Eisriesenwelt near Salzburg, Austria

Whilst caverns made of rock are all well and good, sometimes you want something a little more spectacular. That’s what ice is for, and this complex near Salzburg, Austria is home to the world’s largest ice cave.
Over the years, the flow of air has ensured that walls, stalagmites and stalactites have formed, and some of the frozen formations are up to 20 metres thick.
The result is something that looks like a science-fiction film set, and a walk through the surreal crystalline world is fascinating, if a little on the cold side.
The Eisriesenwelt is open from the end of April to the end of October, and you’ve got a choice of getting there on foot or by cable car.