This cliff-face port is considered a masterpiece of mining engineering.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

One of the largest squares in Europe contains an entire artificial island.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

Sofia's legislative center is continuously reinventing itself.

These cascading falls resonate throughout the Bulgarian forest.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

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

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

An interactive museum-like experience takes visitors back to 1980s Communist Bulgaria.

A striking symbol of the Bulgarian capital.

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

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

The only Malaysian food truck in Italy slings tangy chicken satay that even Italians love.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

Can you see the face staring out at you from the buttress of this bridge?

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

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

An alchemist's “magic door” stands in the middle of a Roman park.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.