A Gothic-style abode built to accommodate the church's three resident peacocks.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

This tiny little island has, as the name says, just enough room for its single house.

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

Check out the underground party scene at the "Burning Man of Brooklyn."

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

This New York holdover was built to provide housing for shopgirls and still does not allow men above the lobby.

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

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

Feral cats keeping the rodent population at bay all across Greenpoint waterfront.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

Eclectic architecture in the woods of New York.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

A perfect replica of the beloved show's first set.

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

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

Play heads or tails with thousands of different coins.

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

Created by four famous men (Henry Hobson Richardson, Frederick Law Olmsted, Calvert Vaux and Thomas Story Kirkbride), the beautifully designed Buffalo State Asylum was resurrected as a hotel and art center...but still boasts a ghost story or two!

Toxic waste disaster that founded the Superfund program.

Church in Manhattan holds the bloody sock of Padre Pio, among with many other unusual relics.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.