Eastern Bloc nostalgia, anybody?

Atop this former dutch railway office sits an interstellar work of art.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

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

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

An abandoned saucer-shaped monument in the Bulgarian mountains.

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

An homage to the medieval rulers of Bulgaria.

A decaying, yet still functioning, work of communist architecture.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

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

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

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

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

This enigmatic Roman tower lurks just outside Belmonte.

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

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

Sofia's legislative center is continuously reinventing itself.

A striking symbol of the Bulgarian capital.

One of the world’s longest pedestrian suspension bridges.