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

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

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

A striking symbol of the Bulgarian capital.

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

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

Rock carving created 1,300 years ago 75 feet off the ground.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

Mysterious standing stone formations looks like a petrified forest.

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

An abandoned saucer-shaped monument in the Bulgarian mountains.