At the largest railway museum in the United States, you can see everything from an early steam engine to a functioning Thomas the Tank Engine.

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

Cryptic messages embedded in the New York City sidewalk.

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

Try not to get slimed in Tribeca.

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

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

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

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

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.