The last of its kind in the country.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

One of New Jersey's oldest surviving buildings still bears the mark of our former British overlords.

This colonial mansion has been home to a staggering number of American historic figures.

Pennsylvanian mass grave and possibly mass murder.

A rare view of a preserved Victorian science museum.

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

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

In the early 1800s, surgery was also a show.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

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

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

Eighteen miniature death-scene dioramas.