Macabre astrological automaton clock dating to the late 1400s.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The history and future of cannabis.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

An out-of-place slice of France, smack in the middle of Shanghai.

The once highest point in China blends symbolic design with a kick of adrenaline.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

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

The most loyal of little dogs, or a Victorian era publicity stunt?

360° views of the city plus five floors of optical illusions and hands-on science.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Go back 50 years with a turn on one of the park's carefully restored vintage fairground rides.

These barriers stand as stark reminders of Northern Ireland's troubled past.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

A hugely vast Irish landscape of barren rock that stretches for miles.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.