One man's ambition created this psychedelic log home.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

A devilishly named gorge that was a sign of salvation for many pioneers.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

A popular rock that acted as a waymarker for American pioneers.

A small town built on an abandoned airfield has former runways as streets and a bar and grill in an old airplane hangar.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.