"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

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

A beautiful oddities shop crammed with strange and morbid curiosities.

Mysterious rocks that ring musically when struck.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Bad farming practices caused this unnatural natural wonder.

A collection of full-size movie monsters opened to the public.

Impossibly life-like natural history models created out of glass by a father and son.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

A historic neighborhood church is reborn as a psychedelic arts collective.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This abandoned sea fort has become an accidental bird sanctuary.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.