This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

The only gallery in New York dedicated to olfactory art and the exploration of scent in art.

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

Eccentric stone cairns built on a public New York City beach.

An illegally built ramshackle mansion tucked in the middle of Brooklyn is now being turned into condominiums.

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

A huge resale shop for the cast-offs of the film & television industry.

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

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

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

Tucked in the back of this amazing antique store is an important piece of medical history.

Built in the 1920s, this co-op in the Bronx feels more like an Italian villa than a typical New York apartment building.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

This unique house, the only one of its kind in Brooklyn, was built as part of a real estate developer's showcase.

This former water source for the City of Brooklyn is now a thriving natural wetland.

Now owned by the National Park Service, this location was once home to illegal boxing matches.

Queen Anne style apartment house built in 1886.

A riverfront park that both remediated and preserved its industrial past.

Devotional offerings and pleas for intercession are left at this Depression-era shrine inside a nature preserve.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

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

This elaborate tunnel is the first structure composed of cast concrete in the United States.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

The mysterious image is believed to show Edward Hyde, 3rd Earl of Clarendon, in a beautiful blue dress.