Vidgelmir Lava Tunnel
Borgarfjordur, Iceland[6.8 miles]
An accessible, family-friendly cave in the Hallmundarhraun lava field, in Borgarfjordur. It’s a great choice for kids, as most of the cave is reached via a walkway, and illuminated by fixed lighting. No squeezing, sliding or slipping required here.
Best for ages: 6+ | £40