In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

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

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

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

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.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

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

The oldest operating pharmacy in the world features 800-year-old recipes.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

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

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

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

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

100 year tradition of fist fights, marked by marble footsteps.

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

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

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

The last Victorian market in Belfast.

It was once nicknamed "the most bombed hotel in Europe."

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

These engineering masterpieces are a dominant feature of the Belfast skyline.

Belfast's namesake river still winds below the city center, hidden from sight.

A museum marks and documents the site of the Titanic's launch.