These historic buildings once housed the headquarters of one of the most infamous gangs of New York.

A hidden "place of interment for gentlemen."

Try not to get slimed in Tribeca.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

Built just after the American Revolution, the oldest row house in New York City still stands in Chinatown.

Avoid gangster interaction while window-shopping.

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

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

A retired oil tanker now offering amazing views of New York City.

The factory that helped produce a dominant form of lighting before Thomas Edison.

The humble fort that saved Washington.

The engineering feat of the Panama Canal was possible in small part thanks to materials developed in this humble Red Hook foundry.

A strip of modern stores in historic buildings.

Four cars from the old system were once on display, but were removed in 2014.

The unassuming structure was part of a Major League Baseball stadium.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

This graceful little figure is a one-of-a-kind version of the cherished character.

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

A 19th century hat factory still stands as a crumbling ruin in upstate New York.