A striking symbol of the Bulgarian capital.

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

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

A dragon-shaped fountain that is said to dispense healing water—unless you're evil.

See gorgeous frescoes at this modest Byzantine place of worship.

After witnessing the rise and fall of three empires, this ancient city was finally destroyed by a series of earthquakes.

A historical puzzle lies at the origins of this structure.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

Artists made this mosque into a marvel of Ottoman baroque architecture.

Depending on the region's rainfall, this church may be partially submerged.

See how paper is made the old-fashioned way.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

Explore a traditional Albanian dwelling that pays tribute to the region's rich history.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

According to a gruesome legend, an architect sacrificed his wife to build this spectacular, 16th-century cathedral.

This fortress-like monastery is covered with intricate frescoes.

An ancient Roman snake god, carved expertly into stone.

Romania's triumphal arch looks out over Bucharest.

A collection of items from a way of life that no longer exists.

This bone-filled cave got its name after they found 140 bear skeletons inside.

The Natural History Museum that time forgot.

A muddy alien landscape that is home to rare species of exotic plants.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

This once-derelict building is now one of the most beautiful bookstores in the world.