The world's most active stratovolcano is almost always erupting.

Bell tower juts out from a village buried under a lake.

Thousands of well-dressed mummies below a monastery.

An amazing collection of wax anatomical models and terratological models.

This zoological museum began as the first great curiosity cabinet.

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

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

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

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

Sofia's legislative center is continuously reinventing itself.

A striking symbol of the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

"Unity, Creativity, Beauty."

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

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

An homage to the medieval rulers of Bulgaria.

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

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.

An abandoned saucer-shaped monument in the Bulgarian mountains.