A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

The cedar tree in Highgate Cemetery earned its title by accident.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

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

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

These historic buildings once housed the headquarters of one of the most infamous gangs of New York.

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

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.

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

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

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

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

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

A celebration of capitalism in Midtown.

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

Try not to get slimed in Tribeca.

An accidentally hidden library containing the ephemeral history of New York.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.