High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The rocks in this arid basin leave trails of movement behind them.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

A 140-year-old castle with underground caves hidden in San Francisco.

A one-of-a-kind collection of a unique medium.

World's largest collection of serial killer artwork and other macabre exhibits.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A huge musical instrument played by the ocean.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A 50-foot tile mural mosaic for the 100-year anniversary of the Statue of Liberty.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

"Looks so real, it's scary!"

Historic house-museum dedicated to the revolutionary gay graphic artist Tom of Finland.

This abandoned stepwell is one of the largest, deepest, and certainly one of the creepiest in India.

The 43-mile route crosses through six islands with gorgeous views of the Seto Inland Sea.

This remarkably intact, 260-year-old cargo ship is only visible at the lowest of spring tides.

A mecca for India's Jains.

An Old West film set seen in countless TV shows and movies is open for the public to explore.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A bike train runs along a disused railway line through the tranquil French countryside.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."