Mysterious standing stone formations looks like a petrified forest.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

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

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

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

A flamboyant five-story building in Bulgaria resembles a crawling snail.

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

An abandoned saucer-shaped monument in the Bulgarian mountains.

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

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

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

The first mosque in the world to receive electricity.

This enormous abstract sculpture is part jungle gym, part elaborate noise-making machine.

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

A tribute to smugglers and the Butter Wars.

Rediscovered in 1992, this abandoned medieval village once flourished by fishing and piracy.

Take a leisurely walk through the park to find the seven giant troll sculptures hidden throughout the park.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

A huge old mansion full of thousands of toys, each there to be used and played with.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

A once-magnificent collegiate church is falling into ruin.