A winding cave grotto walkway built to provide employment for veterans after World War I.

Heralded as the oldest statue in London.

These ornate arches show how the course of the River Thames has changed.

The final resting place of a German diplomat's beloved companion.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

One of the oldest surviving buildings in Colchester dates back to the 11th century.

Dating back to the early 12th century, this is the first Augustinian priory established in England.

This stretch of beach is the site of a prime watering hole and a primate watchtower.

This statue commemorates one of medieval England’s most courageous heroes.

The final resting place of many of Germany's most famous communists.

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

Cold war icon and onetime "hole" in the iron curtain.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This platform is now a memorial dedicated to those who were deported during the Holocaust.

Metro station with a claim to rock n' roll fame.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Several colorful mosaic panels depict the life and creative genius of the Master of Suspense.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

Charles Babbage's proto-computer, painstakingly brought to life.

This museum inside a museum tells the story of London's timepieces.