These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

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

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

Two plaques commemorate the site of Shakespeare's first theatre.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Giant, friendly pelicans in Central London, the most unlikely of places.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

This watchtower once presided over the Berlin Wall.

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

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

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

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.