Located between Alaska and Yukon Bay in Canada, Hubbard is one of the largest glaciers in the world.
The people of Hawaii consider this to be a sacred place and the home of the Goddess Pele.
One of the world's most active volcanoes, with a constant eruption since 1983.
The volcano that changed the history of the United States in just minutes, today a National Volcanic Monument.
It preserves the world's longest known cave system, with over 360 miles of caves.
A magic world is revealed when visiting the largest caves in Eastern America.
More than 100 caves, 250 million years old.
This ice cave in California has some interesting and strange ice formations.
