This hidden art nouveau gem was designed by an architect in search of a national style.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

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

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

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

The world's oldest bookshop still in operation.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Go inside to really appreciate this 500-year-old technological masterpiece.

Venice's island of the dead.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A church of bones, decorated with 40,000 human skeletons.

Real bones which are said to have belonged to a Polish dragon.

The world's most important buildings shrunk to a tiny size.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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

The most visited, and possibly most controversial, museum in Germany.

A little sculpture with a large wardrobe.