Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

A hidden "place of interment for gentlemen."

Avoid gangster interaction while window-shopping.

Cryptic messages embedded in the New York City sidewalk.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Visit the monolithic tomb of America's most famous general.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

This luxury shopping lane has been protected by its own tiny police force for over a century.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Charles Babbage's proto-computer, painstakingly brought to life.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

Plot your trip through the city on the sidewalk.

An artist's cute bronze subway sculptures belie his violent artistic past.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Wine bottle sculpture with a ship's stateroom inside.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

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

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

Slyly buy a shake in the Parker Meridien lobby.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

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

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.