This former papal residence was the site of an infamous incident known as the “slap of Anagni.”

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Mountain where Jesus was first tempted by the Devil.

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

Barça football fans might see the insignia hidden in a church window as a divine sign.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This single room has survived the centuries with almost no deterioration.

This unique building in the main square stands out among the city's typically Baroque architecture.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This airport currywurst stand is made out of retro airplane parts.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

There has been an astronomical clock on this spot since the 14th century.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

This monastery set over a holy cave contains the oldest known painting of Saint Francis of Assisi.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.