Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

Stairs often replace streets on the steep slopes of this old mining town.

This Old West hotel, the longest in continuous operation in the state of Arizona, is claimed to be haunted.

This open-pit mine is now an abandoned symbol of Bisbee's copper-mining heritage.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

One of America's oldest stadiums was also the site of one of the most brutal anti-labor acts in American history.

What is the Thing?

A reproduction of earth's many biomes.

Miniature art that tells an enormous story.

This church on a Tohono O'Odham reservation has stood since 1797.

This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.

At the edge of the high desert, California's second-largest natural lake is home to a unique subspecies of trout adapted to its alkaline waters.

This hiking/biking/horse trail along an old railroad grade features trestles, tunnels, and a roadless stretch through the scenic Susan River canyon.

The flow from this waterfall sometimes comes out of springs below its rim.

This hotel has hardly changed in over a century, like a time capsule of old Oregon.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

A beautiful footbridge with over 2,000 glass sculptures along the walls and ceiling.

Tacoma's historic Beaux-Arts train station is now a federal courthouse featuring large-scale glass sculptures by artist Dale Chihuly.

This municipal sundial has been keeping time along Tacoma's Commencement Bay since 1978.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

Multiple waterfalls and several historic CCC buildings anchor this state park in Oregon's Willamette Valley.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.