This former coal gasification plant found a curious second life as a popular public park.

A museum dedicated to the history and exploration of both popular music and science fiction.

A giant Troll lurks under one of Seattle's oldest bridges.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This stoic, if derpy, giant stands as a monument to Oregon's statehood and the novelty culture of yesteryear.

Instead of fruit, the branches of this tree are brimming with hopes and dreams.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

This abandoned boat sits on a nude beach, is shaped like a UFO, and is covered in graffiti.

Definitely not a clown bar.

A Wild West saloon that helped define a generation of psychedelic rock.

A giant open-air sculpture made of over 200 full-sized boats.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

A new kind of theme park for adults off the Las Vegas Strip.

The best Tiki bar in Las Vegas.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

This municipal playground was co-created by the father of one of the most playful characters ever.

Machinery left over from California's once thriving mercury industry now attracts artists and explorers.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

Detailed facade of a brownstone in Boerum Hill.

Waterway populated with abandoned projects, including a submarine.