This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

Five candy-colored villages on the Italian Riviera.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Pilgrimage site for star-crossed lovers.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

Sofia's legislative center is continuously reinventing itself.

A vast Communist-era exhibition space in the Bulgarian capital.

A striking symbol of the Bulgarian capital.

This historic black and white monastery is one of Bulgaria's architectural jewels.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.