A crumbling hospital from the 1850s on Roosevelt Island.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Brought to you by the makers of fiberglass dinosaurs.

Real bones which are said to have belonged to a Polish dragon.

Typewriter museum housing more than 1,500 machines preserves the history of the grandfather of computers.

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

A wartime promise becomes a shrine to Our Lady of Lourdes.

A long abandoned hospital building on the outskirts of NYC.