Cryptic messages embedded in the New York City sidewalk.

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

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

This abandoned subway station can still be seen on regular commuter trips.

Lie in a hammock where George Washington stood.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

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

Mysterious 500-year-old tapestries depict a unicorn hunt.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

Tucked in the back of this amazing antique store is an important piece of medical history.

A terrific purveyor of natural history objects and curios.

This enigmatic artifact remained buried in a churchyard for years.

3,000 market stands in five former Zeppelin hangars.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A black cat protests the City Guild in Riga's Old Town.

The statue of a legendary giant who carried Christ and shouldered the world's sins.

Art and a pun, all in one.

Walk through Czech history in Prague's largest graveyard.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A bus with a butt and biceps to put Olympic athletes to shame.