A curious memento mori hangs in the magnificent Cathedral of Segovia.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

You don't have to be an ambassador to dine like one.

Constructed in the 1920s, this former pencil factory is now an office building.

The largest known open fault in the United States is basically a giant natural refrigerator.

Those belting out show tunes in this West Village piano bar might not realize it marks the site where Thomas Paine died in 1809.

Ever wanted the laymen's version of your credit card fine print?

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The first piece of public art dedicated to LGBT rights.

The Hudson River School comes alive at this palatial estate.

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

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

What happens here stays here – unless it affects the whole world.

Discover the taste of mold.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

100 massive sculptures in the Hudson River Valley.

Salute the leader of the proletariat.

A modern zoetrope on the New York City subway.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

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

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

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