A misnamed well, with a deep dark past.

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

A striking symbol of the Bulgarian capital.

Sofia's legislative center is continuously reinventing itself.

"Holy Wisdom" overlooks the city that became its namesake.

See how paper is made the old-fashioned way.

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

What happens when you cross a mayor and a painter?

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

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This bridge was constructed from the rubble of the infamous Bastille.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The video game-themed street art first popped up in the French city.

Opened in 1956, the first modern indoor shopping mall in the world was inspired by the shopping arcades found in European cities.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This tiny chapel withstood a massive mudslide and flash flood.

Five candy-colored villages on the Italian Riviera.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.