Measuring more than 60 kilometers in length, this is the largest glacier in continental Europe.
Harker is a tidewater glacier on South Georgia Island, in the Atlantic Ocean.
The largest glacier in the Alps, with a length of 23 kilometers and an area of 120 square kilometers.
They are not the largest in the world, but they are truly amazing and highly publicized, being a major attraction in Africa.
Antarctica is home to numerous glaciers and is a popular destination, with the number of tourists increasing to 35,000 per year.
With a length of 62 kilometers, Baltoro is the longest glacier outside the polar regions.
It preserves the world's longest known cave system, with over 360 miles of caves.
One of the largest natural caves in France, discovered in 1880.
Fantasy Cave is definitely one of Bermuda's secret treasures and a 'must see' attraction.
A magic world is revealed when visiting the largest caves in Eastern America.
This tourist attraction in China is over 180 million years old.
More than 100 caves, 250 million years old.
A group of two caves, home to the oldest complete skeleton in Britain.
This ice cave in California has some interesting and strange ice formations.
A crater lake located 150 kilometers from Tokyo.
The most visited cave in Europe, and the biggest cave in Slovenia.
