One of the largest natural caves in France, discovered in 1880.
A group of two caves, home to the oldest complete skeleton in Britain.
The most visited cave in Europe, and the biggest cave in Slovenia.
These four caves, with their weird formations and impressive chambers, are the most famous tourist attraction in Mallorca, Spain.
Mount Etna is one of the most active volcanoes in Europe and is Sicily’s best-known natural attraction.
The volcano with the world's longest recorded period of activity: more than 2.000 years.
One of the world's most dangerous volcanoes, with many people living near its crater.
