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

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

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

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.

A collection of art from Bulgaria's time as a communist state.

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

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

This fifth-century church is one of the oldest Christian sites in the Balkans.

Step inside this medieval Orthodox gem and travel back to the 16th century.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

An abandoned masterpiece of Soviet Brutalist architecture.

This micro-nation may be some sort of prank, but its constitution sure seems official.

An angel that hatched from an egg!

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

One of the oldest, tallest, and most haunted lighthouses in America.

St. Augustine's record-setting narrow street was designed to protect against pirates.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”