Caves to Explore in Valais

The St. Leonard underground lake is the largest of its kind in Europe. This mysterious cavern was discovered in 1943, but the lake was not open to the public until 1949. The boat trip to the lake lasts over half an hour and can accommodate up to 40 people. There is also a small children's play area and a brand-new educational area, with info on how the cavern and the Alps were formed was set here.