The lasting remains of an airfield used during the Spanish Civil War.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Geological storytelling.

Cliffside houses provide a spectacular view from their perch above the valley.

This museum is known as the "Land of the Dinosaurs," but its full-scale dino models are just the start.

Walls of stone rise up from sinkholes caused by underwater erosion.

One of the most important Celtic-Roman archaeological sites in Spain.