A black volcanic beach in southern Iceland, in the charming village of Vik.
A black sand beach surrounded by striking green vegetation and blue waters. Amazing contrast.
A beautiful black sand beach on Hawaii's Big Island, home to endangered species of turtles.
A beautiful, secluded and idyllic beach in California.
Taking a cruise here you'll see an awe-inspiring scenery and a very diverse wildlife.
It preserves the world's longest known cave system, with over 360 miles of caves.
Ali-Sadr is the largest water cave in the world.
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.
The park displays the hardened results of over thirty separate lava flows exposed at Lava Beds.
This is a spectacular park and the largest in Portugal.
