Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

A distinctive building that incorporates a mythical beast into its architecture.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

The 1852 novel "Uncle Tom's Cabin" lends its name to a subway station, a street, and several shops on the edge of Berlin.

This tiny alleyway is now a shrine to a subculture riot between the mods and rockers.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A carved grave marker from the 2nd century is mounted in the alcove wall of this Bavarian church.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

This Roman arena once played host to bloody gladiatorial battles.

Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

This unique sculpture is often overlooked by pedestrians.

This macabre shop, filled with art, oddities, and taxidermy is hidden in the heart of the French Quarter.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

A roadway designed for a visiting monarch.

A brutalist gem towering over the heart of Milan.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

The medieval network of canals hidden underneath the city is opened to explorers each year.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.