Cave of the Winds, Manitou Springs, Colorado. A family-friendly cave tour: beautiful formations, well paved paths, and not too many steps. From Travel50StatesWithKids.com #familytravel #colorado #coloradosprings
Lofthellir, a 3500 year old lava cave, is a world of ice and darkness, located in the northeastern part of Iceland near Lake Myvatn. It is about 370 metres long. You can choose whether you want to start the tour from Akureyri or the Lake Myvatn area.