A hollow cement depiction of time's inexorable effect on the human body.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

America's only nuclear missile silo open to the public.

This bomb shelter-themed bar has barely changed since it opened.

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

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

The Magical World of George Phar Legler.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

A frozen relic of Seattle's hydroelectric boom is now a teaching facility for future engineers.

Former farm staffed by mental patients is now a public park.

Orcas on display and in the water.

Mile-long cave system near Great Smoky Mountains.

The first keystone arch railroad bridges constructed in America.

Journey through a bit of nostalgia inside this classic record and video store.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

The second tallest railway trestle bridge in America.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

The first park built over a freeway is a brutalist masterwork.

Old submarine parts have been converted into faux whale fins.

This dilapidated ship carcass covered in trees is a striking sight.

An enormous, inside-out glass globe built in 1935.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.