A small Second Empire-style building is one of only seven remaining lighthouses on the Hudson River.

The Hudson River School comes alive at this palatial estate.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

The remains of what was once the world's steepest passenger funicular.

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

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

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

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

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

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

All that remains of a magnate's dream home is a historic gate and an abandoned public pool.

Staten Island's original central park is the former home of the city water supply as well as thousands of immigrant graves.

A town trapped in time - 1958 to be exact.

Once America's longest-manned military fort, now an abandoned hulk.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

The home of the first American-born saint is one of the only curved buildings in New York.

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

Every inch of this chapel is covered in craftsmanship from across the world.