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

Self-built house and sculpture park where the creator can still be seen in a glass coffin.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

I fought the law and the precinct caved in.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

The cobbled together compound of a deceased artist which now serves as a filming location.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

A bizarre house filled with an astounding array of collections.

A hand-built folk art installation covered with messages of God's love.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Volunteer-run library dedicated to exploring five decades of activism history.

This innocent-looking townhome is actually a subway exit.

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

Abandoned power station once home to a squatter community, now being developed into an arts center.

Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

Risk arrest while partying to fund art.

Reverend Jen's unique museum/living room showcases her troll collection.

Waterway populated with abandoned projects, including a submarine.