This community on a small Venetian island has taken to painting their houses in bright neon hues.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The most visited, and possibly most controversial, museum in Germany.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Home to items never before seen by the public.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

America's most famous piece of self-built architecture.

Elevated freight railway turned wildly successful urban park.

A 16th-century horror show built in a lovely Italian garden.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

San Francisco's newly reopened hands-on science museum.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

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

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.

Art and armour fill every inch of this rich kid's Italian villa.

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

Secret refuge and museum of the Duke of Florence.

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.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The largest and most famous wax anatomical collection anywhere in the world.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

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