An abandoned saucer-shaped monument in the Bulgarian mountains.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

The world's tallest boat lift stands as a massive piece of industrial tourism.

A striking symbol of the Bulgarian capital.

UNESCO-protected ancient burial ground.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

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

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

These cascading falls resonate throughout the Bulgarian forest.

At this 16th-century monastery in rural Bulgaria, visitors can also spend the night.

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

An homage to the medieval rulers of Bulgaria.

Sofia's legislative center is continuously reinventing itself.

These natural cliffs look like they are a part of an old castle complex.

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

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

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

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

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

A jazz band formed by African water animals in the heart of Flemish Brabant.