Geology

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Once an ancient Roman bath, now a hotbed of geothermal energy and a hub for energetic innovations.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

Volcanic activity causes small pools of super-heated mud to boil furiously.

Inky sludge oozes to the surface of this beach thanks to a rare natural tar seep.

A stone circle on the slopes of a Caribbean volcano commemorates the leader of an anti-slavery uprising.

Hundreds of stones dangle from barren trees in the middle of the desert.

A collection of beautiful crystals shaped like freshly plucked roses.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.