This mouldering abandoned mental hospital was once a center for progressive healing.

The lost town of Neversink, sunk by New York City.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

The Connecticut village named for its subterranean thunder.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

House used in the 1971 horror film "Let's Scare Jessica to Death."

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

A popular tourist cave with a dark past.