Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

This derelict building used to house infirm Freemasons, their widows, and orphans.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

All that remains of a magnate's dream home is a historic gate and an abandoned public pool.

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

The graphite created here was used in the manufacturing of pencils.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

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

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

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

This once luxurious Catskills resort is now a haunting ruin.

The saddest little diner in New York.

A long abandoned hospital building on the outskirts of NYC.

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

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

This abandoned cemetery is crumbling into ruin, exposing the artifacts and bodies buried there.

The remains of a failed subway in upstate New York is now an underground graffiti bunker.

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

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

The final resting place of some of Staten Island's earliest settlers and their descendants.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

This Mexico City subway station will make you feel like you've been transported to the London Underground.

This highly decorated dam is one of Guanajuato's most unexpectedly beautiful public works.