The imposing structure was originally established in 1580 as a military stronghold.

Visitors can still take a train to this former train station turned museum.

This recreated Roman outpost stands above its buried predecessor.

Meet the bronze beloved pet to a family of famous peeing statues.

Climb inside an iron crystal magnified 165 billion times its normal size.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

An ancient Roman relief beautifully preserved on the façade of a house.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

Remarkably preserved body discovered in a peat bog.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

The Sun King's military models, saved from the Louvre.

This Parisian gem is one of the most incredible ethnographic museums in the world.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This massive library holds what was once the largest book collection in the world.

Is this statue at Naumberg Cathedral the fairest of them all?

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

This strange sculpture is an enigmatic icon of this medieval German town.

This cheeky statue of a man defecating gold coins graces the facade of a medieval guildhall.

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

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.