A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

New York City's only radical feminist independent bookstore.

Avoid gangster interaction while window-shopping.

Lie in a hammock where George Washington stood.

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

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

A celebration of capitalism in Midtown.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."