Geology

In Parr Park, thousands of painted rocks line this walking trail.

Located in the remote Monitor Valley, this travertine bowl contains a scalding pool of water.

In the middle of a barren desert, a massive, solitary rocky thumb juts out.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

A glacial valley filled with silver beech trees in the mountains of Portugal.

These oldest of these "embroidered stones" were carved 4,000 years ago in a high mountain valley.

This crumbling coast and its teetering tower are literally filled with history, but they are also at great risk of becoming history themselves.

This large boulder was used as a lookout point by Revolutionary War militiamen.

This tiny site in Iowa, part of a patchwork national wildlife refuge, is home to ancient flora and fauna.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

This narrow fjord-like bay is the largest ria in the Mediterranean Sea.

Of five volcanoes located in the massive Tengger caldera, this cone is the youngest and most active.