Gigantic Romanian salt mines used to heal respiratory conditions.

This fortress-like monastery is covered with intricate frescoes.

Massive, unfinished broadcasting station stands as a monument to the fall of communism.

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

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

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

Mysterious standing stone formations looks like a petrified forest.

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

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

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

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.

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

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

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

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

A medieval church built up to defend its village.

No one knows who built this strange cave of worship or exactly why.

The growing stones of Romania.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

Hundreds of boat-shaped headstones fill this graveyard as part of a centuries-old custom with mysterious origins.

This mushroom-shaped rock has frustrated and fascinated locals for centuries.