The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A hands-on traveling collection of the innovative devices of yesteryear.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

A collection of unique outdoor sculptures surounded by the beauty of nature.

The loneliest island in New York.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Visit the site of a subway powered by nothing more than air--and lots of it.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

One of only two remaining Victorian-era greenhouses in New York.

19th century cemetery hidden in Brooklyn's Prospect Park.