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

Step inside Lucy, the world's largest "elephant."

Collapsing castle on the Hudson river was once the storage site of military surplus business.

100 massive sculptures in the Hudson River Valley.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

Series of storm drains connected to a dark urban legend.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

From scholastic to sepulchral - now under reconstruction.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

A crumbling hospital from the 1850s on Roosevelt Island.

A huge resale shop for the cast-offs of the film & television industry.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Come for the speed, leave in love with the desert.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Final resting place of two dozen New York City harbor ships.

A long abandoned hospital building on the outskirts of NYC.

Home to the "Circus" trees created by Axel Erlandson.