An alley covered with 20 years of bubble gum.

Where NASA's satellites and rovers phone home.

This derelict superstructure was a very important warning system for the Soviet military.

One of the best collections of antique printing machinery in the world.

North America's largest accredited model railroad museum.

A house built from trash known as the poor man's Hearst Castle.

Legendary prop shop filled with one man's collection of scientific curiosities.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

A self-built castle made by a mysterious man.

Historic funicular railway, believed to be the shortest railroad in the world.

"The Hoppiest Place in the World" holds the world’s largest collection of bunny memorabilia and is a singular testament of a couple's devotion to all things Leporidae.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

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

Historic Greenpoint theater, turned roller disco, now housing a chain pharmacy store.

World's largest collection devoted to one fruit.

Marta Becket's hand-painted theater in the desert.

Explore 10 acres of environmental sculptures.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

A museum dedicated to exhibiting remarkable outsider art.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

America's most famous piece of self-built architecture.