An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

A Spanish town built into the cliffs.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

The ancient tomb acts as a calendar that keeps perfect time.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

An alien church provides much needed silence in the midst of a Finland shopping center.

A subterranean house of worship carved right out of the bedrock.

This micro-nation may be some sort of prank, but its constitution sure seems official.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

Flamboyant architecture from the turn of 20th century.

A black cat protests the City Guild in Riga's Old Town.

The statue of a legendary giant who carried Christ and shouldered the world's sins.

3,000 market stands in five former Zeppelin hangars.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

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

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

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

Double spiral staircases are not unheard of, but they are very rare.