This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

This Central New York ghost town was once a prosperous railroad community.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

A record-size collection of wild-haired troll dolls tells the story of the mythical creature's roots in Scandinavian folklore.

A vertically floating hemlock controls the waves and weather at Crater Lake.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

These early tent-shaped grave coverings are unique to Appalachia.

Ruins of an American Civil War iron forge still survive today.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

This picturesque abandoned home is rumored to be a spite house.

Small, privately owned island divided between Michigan and Ohio with abandoned vacation homes and a derelict lighthouse.

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

The world's last remaining store of its kind.

These disused steel furnaces are now haunting ruins that may one day be a national park.

This Boy Scout retreat acted as "Friday the 13th"'s original Camp Crystal Lake.

Ship skeletons haunt Baltimore's waterways.

An unfinished rail tunnel that has since been used to house cheese and bats.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

America's first public mental health facility.

Beautiful hillside Vermont cemetery with amazing funerary art.

Trash escaped from a landfill to fill beaches with all kinds of treasure.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

This former maximum-security prison is creepy, sobering, and supposedly haunted.