This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

An abandoned stretch of highway, deteriorating next to the operational one.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A toxic ghost town sitting atop a massive coal fire.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

This was once the largest four-sided clock in the world (yes, even bigger than Big Ben).

The only thing these street signs will help you navigate is your imagination.

A renowned Civil War veteran, this Bald eagle now presides over the Wisconsin State Assembly.

The tragic death of 19-year-old Mabel Tainter in 1886 led to the construction of this unique Victorian-era theater in the northern woods of Wisconsin.

The building was originally a gas station built to resemble a Japanese tea house.

Comprised of Spanish war cannons, this sculpture once graced the bow of a WWI warship.

Prayers and messages of hope decorate the ceramic tiles of this pavilion.

As the glaciers retreated out of northern Wisconsin, this unique natural wonder was crafted.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.

A bypass decorated with large wooden troll carvings.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

Homemade outdoor church and sculpture garden decorated with glass shards.

More than 5,000 contemporary and "historic" mustards from around the world.

The arboretum whose marshy soil sucked up the dreams of housing developers.

This striking art museum holds an amazing series of curiosity cabinets.