A condensed piece of China floating in a Dutch harbor.

Inside this metro station is a section of the city's former medieval fortification.

These lights mark the area of Rotterdam that was bombed and burned in 1940.

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

The remains of the great moral philosopher reside in a university in London.

An architectural oddity hides in plain sight on this iconic London bridge.

This ancient Egyptian obelisk still bears the wounds of World War I.

Hidden beneath the streets of London is a secret subway that only carried mail.

This striking statue brings a scene from the African savannah into central London.

The bronze uniforms commemorate the vital role of women during World War II.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

This coffee shop lies hidden beneath a historic church.

This 1920s Dutch barge is now a floating bookstore.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

These lamps were created to expel sewer gases after an event known as The Great Stink.

Take afternoon tea in a 17th-century almshouse.

Huge winged monument in the United Kingdom.

England's largest white horse isn't even white.

This gorgeous space is England's largest independent library outside of London.

The remains of a Dominican friary, once one of the largest of its kind in the United Kingdom.