A huge musical instrument played by the ocean.

Rippling sand dunes frozen in the Arizona rock.

Dramatic river bend surrounds a natural red-rocked pedestal.

An urban laboratory.

An emerald-green grotto just a short trip from Austin.

Home of Philip Johnson, one of the 20th century's most influential architects.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

Rummage through this sunken ship, but leave your scuba gear at home.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

A hip bar decorated with walls of golden skulls.

A 9-story, poured concrete structure which was used as a glue factory with an indelible smell.

Queen Anne style apartment house built in 1886.

A modern addition to the Greenpoint skyline.

A charming "tea atelier" hidden away in Greenpoint, Brooklyn.

Once a ferry dock, radio transmitter, and now a new Greenpoint park.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

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

Historic Greenpoint theater, turned roller disco, now housing a chain pharmacy store.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).