This fish builds impressive underwater sandcastles
An alien symbol at the bottom of the sea? For years, these massive underwater sandcastles have been a mystery. Meet their unexpected architect.
How cacti survive in the desert
Wave Rock is one of Australia's must-see features
The Kilauea volcano is only one of 169 active volcanoes in the USA
The extraordinary Salt Pans of Maras
General Sherman: the largest living organism in the world
The Horsetail fall attracts thousands of visitors each year