Baroque celebration of the end of the Great Plague of Vienna.

The solemn exterior conceals an opulent interior of this 17th century church.

A silly medieval mural preserved on the side of a Viennese house.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Time stands still at this serene burial ground in the center of Budapest.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

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

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The 1,000-year-old abbey is the birthplace of modern musical notation.

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

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

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

The remains of a sunken military ship wreck visible through clear water.

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

An extraordinary collection of 18th century anatomical waxworks.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

Time has been frozen at this station since the bombing in 1980—or so it was believed.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

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

Secret refuge and museum of the Duke of Florence.