The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

A winding path built in secret on the edge of the continent.

Get a taste of the Wild West and a glimpse into the gold rush in Goldfield's oldest continually-running business.

This once bustling boomtown hotel is now the hottest spot in Nevada for ghost hunters.

Eulogizing an unknown man's unusual demise.

An errant donkey ushered in a new era of mining in Nevada.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

There's nothing creepier than a cemetery next to a clown motel.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

San Francisco’s condensed garden of incredible plant growth.

The oldest lawn bowling club in the United States.

The legendary statue-hating superintendent of Golden Gate Park is honored with... a statue.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

The best place in the park to test out your throwing arm.

San Francisco’s century-old Christmas Tree.

An overlooked and unassuming engineering marvel.

These subterranean storage areas hold emergency water reserves.

Radioactivity still cause for concern at this urban explorer's paradise.

A Roman-inspired temple once controlled half of San Francisco's waters.

Location of the most powerful laser in the world, and the potential birthplace of tiny stars.

The longest burning light bulb in the world.