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.

The mummified relic of St. Antoninus.

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.

The middle finger of modernity.

Many famous English poets including Elizabeth Barrett Browning are laid to rest at this Swiss-owned cemetery in Florence.

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

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

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

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

Five candy-colored villages on the Italian Riviera.

The bomb-ravaged remains of of a colossal Neptune.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

This sculpture honors the man who was known as the "Righteous Among the Nations."

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

This monument depicts a harrowing event involving an escaped polar bear.

People leave coins atop an unusual grave marker in one of Scotland's oldest burial grounds.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Near this coastal cave stands a small memorial to the hermit who made it his home for three decades.