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.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

The leathery remains of a woman who died in the 13th century now lie in a church named for her.

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

Eat the ultimate iteration of Portugal's most beloved pastry.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

2300-year-old Roman road connecting the empire.

A collection of objects supposedly singed by the hands of souls in purgatory.

Plaques on its facade commemorate the Tiber's most destructive deluges.