One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Where Venice's gondolas go for a tune-up.

Da Vinci's equestrian statue, 500 years in the making.

Ancient ruins hidden underneath a modern luxury hotel.

The mark of the Devil's horns on a marble column in Milan.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

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

Two stone columns flank the grand Venice square, but there were supposed to be three.

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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A lover's walk between hilltop towns, decorated with graffiti love notes.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.