This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

The world's largest military aircraft cemetery.

An urban laboratory.

In the 1950s, two women saved this grand theater in the Colorado mountains from demolition.

The fifth-longest natural arch in the world, and the longest outside China.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The only thing still moving in this town is the eponymous hot spring.

The "lovely red Vega" of the legendary record-settling pilot.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Perfect your fly fishing technique on their practice ponds.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

A modest reminder of treacherous waters at the Golden Gate.

San Francisco's first World's Fair, dedicated to the wonders of California.

The sole surviving relic of the San Francisco neighborhood cobbled together from old horsecars and streetcars.

Only hotel where you can legally launder money.

A miniature view of the park, caught in time.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.