Cueva del Viento – Spain (8/20)

The Cueva del Viento (Cave of Wind) is located on the Canary Island of Tenerife. It extends for over 17 kilometers (10.5 miles) and is the largest volcanic cave in Europe. This unique cave system is formed from the lava flows of past eruptions and is an extraordinary display of volcanic rock formations. It offers a different kind of spelunking experience compared to limestone caves.