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

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

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

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

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

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

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

One of the world’s only pink lakes where it's possible to take a dip.

A Soviet-style monument, built after transferring the remains of heroes from their graves.

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.

An abandoned saucer-shaped monument in the Bulgarian mountains.

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

At this 16th-century monastery in rural Bulgaria, visitors can also spend the night.

These cascading falls resonate throughout the Bulgarian forest.

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

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

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

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

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