The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

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

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

This zoological museum began as the first great curiosity cabinet.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Renaissance villa and gardens complete with a tormented colossus.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

A fortified city, home to a remaining population of five families

Eighty million natural history specimens call this gargantuan museum home.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

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

The final resting place of soldiers' loyal canine companions.

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

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

Sweden's "good old days" painstakingly re-created in a model village.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

Macabre astrological automaton clock dating to the late 1400s.