The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

The decaying remains of a 1960s mechanical wonderland that never officially closed.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

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

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This abandoned factory on the Hudson River once churned out a million bricks a week.

100 massive sculptures in the Hudson River Valley.

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