A memorial to the 1913 tragedy that helped protect the workers of the future.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

An elaborate memorial to a man local legend says died of a broken heart.

The final resting place of Harriet Tubman and other famous historical figures.

Eulogizing an unknown man's unusual demise.

Toxic waste disaster that founded the Superfund program.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

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

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

This once luxurious Catskills resort is now a haunting ruin.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

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

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

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.

This abandoned subway station can still be seen on regular commuter trips.

This forlorn park is the result of a failed investment turned tax dodge.

Reforestation in action is the main attraction in this abandoned quarry.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.