Op-art architecture designed for happiness.

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

Museum devoted to the artificial language of Esperanto.

Handsomely crafted representations of our round planet.

Baroque celebration of the end of the Great Plague of Vienna.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Fantastic stories on a miniature railroad.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

This subterranean necropolis holds three floors of antler-dug grave caves.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

The best-preserved Roman small town in North Africa.

Founded in 670, this ancient mosque is an architectural time portal.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

Traditional 11th-century outdoor tannery.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

Mosaics, storks, and brothels—this ancient city has it all.

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

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

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

The "Prussian Versailles" that is as glorious today as when it was built.

Come stay at a live-in art installation.