Outsider art meets paleontology at this roadside reptile repository.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

A "hospital" where people went to be quarantined, die, and be buried in the yard.

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

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

Pittsburgh's literal underground railroad.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Take an otherworldly journey in a school dedicated to out-of-body experiences.

This abandoned amusement park was built on a site with a dark history.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

An abandoned asylum incorporated into a college campus.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Exact replica of the ancient monument, but much, much lighter.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

America's post-nuclear-attack chambers of Congress.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Two insane asylum bodies embalmed by an amateur.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Eighteen miniature death-scene dioramas.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Walk through the history of American pop culture.

Remnants of a storybook amusement park hidden behind a strip mall.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.