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

The last four extravagant street signs of London's historic banking street.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

London's smallest police station is barely the size of a phone booth.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

Step inside Lucy, the world's largest "elephant."

The remains of a century-old mansion that met a fiery demise years after it was deserted.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

An unusual round church in London with a Templar past.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Berlin's old airport.

A restaurant and observation deck built in a unique broadcasting antenna.

Super-heavy Nazi architectural experiment.

Art and a pun, all in one.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

Yo, Adrian!

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.