The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

A bit of retro transportation flair preserved in the world's largest department store.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Nikola Tesla's former home contains an homage hidden from plain sight.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

More gold than anywhere else, ever.

New York City's smallest piece of private property.

A hip bar decorated with walls of golden skulls.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

New York's oldest magic store.

Try not to get slimed in Tribeca.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

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

This unreal Portuguese palace looks as though it's made from a pile of different castles.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

A small shrine dedicated to a god of lightning and electronics.

The first location of the eventual video game giant.