The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

A medieval Italian village is fighting depopulation with this vibrant annual street art festival.

Claude Monet was baptized in this lavishly ornate Paris church.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

A huge enchanting public park just outside the ancient walls of Rome.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

This medieval Italian village was transformed into an architectural marvel by the famous "Papessa" Donna Olimpia.

A spiritual sanctuary in a natural cave.

The bright red cars take travelers through breathtaking Tuscan scenery.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

The sunlight passing through the opening of this huge cave system creates a magical effect.

A cone-shaped top and cylindrical body set this 900-year-old structure apart from other Italian bell towers.