Astounding collection of coin-operated games and automata.

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

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

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

An invitation-only museum of items natural and bizarre, arcane and exotic.

This print shop boasts one of the largest pinball arcades in San Francisco.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

This shop specializes in oddities and Victorian-inspired wonders.

San Francisco Bay's ghost town.

The largest permanent Monopoly board makes one of the longest games even bigger.

An extensive collection of ancient Egyptian artifacts and mummies.

This hidden fire lookout offers spectacular views of Sequoia National Park.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Where NASA's satellites and rovers phone home.

Decommissioned experimental solar facilities that pioneered solar energy technology.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

This corn maze so big you may want to pack a lunch, and possibly a flaregun.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.