Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Built by prisoners of war, the largest small-scale model ever built includes eight miles of tiny streams that now sit abandoned.

A multiversal transit station located right below a highway interchange.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

Guns that have been defending San Francisco since 1904.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

An overlooked memorial honoring the local Washington residents who died in World War I.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.