Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This gateway to subterranean Hanover plays jazz, pop and rock to surprised passersby.

After this historic church was destroyed by World War II bombing, its blackened shell was left standing as a monument.

Striking occult iconography on a medieval German church.

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

Romania's triumphal arch looks out over Bucharest.

This fortress-like monastery is covered with intricate frescoes.

A stunning 18th century pharmacy and medieval chemist's collection.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

Something's watching you.

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

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

A massive cave once a secret military base is now home to thousands of bats.

An homage to the medieval rulers of Bulgaria.

Sofia's legislative center is continuously reinventing itself.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

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

These cascading falls resonate throughout the Bulgarian forest.

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

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

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

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

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

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