The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

Morocco's Argania trees are infested with nut-hungry goats.

The corpse bride of Portugal.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Fortified medieval tower house with lovely roof garden.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

Standing stones found on a construction site are re-erected.

CERN's beautiful, bending sculpture is a tribute to the spread of knowledge.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

The library's graceful rotunda is like a bibliophile's temple.

Stockholm's deepest subway station is also a stunning ecological wonder.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

The bears of Bern have been a city highlight for over 500 years.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

A historic observatory precariously perched at the "Top of Europe."

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.