The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

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

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

Unrepaired walls from a 1920 anarchist bomb attack.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Hear the tales of New York's most notorious criminals.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

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

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

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

One of Cincinnati's greatest fighters once trained at a now defunct gym in this Over-The-Rhine neighborhood.

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

Located within a historic park, the beacon is the oldest standing structure in Miami.

Former villa and estate of James Deering developed to preserve native tropical forests.

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

It's a pretty creepy lock-up.

St. Augustine's record-setting narrow street was designed to protect against pirates.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

An 18th-century Spanish watchtower made entirely of seashell and concrete.