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

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

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

UNESCO-protected ancient burial ground.

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

A striking symbol of the Bulgarian capital.

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

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

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

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

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

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

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

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.

This 15th-century church houses priceless works of art from a range of Croatian artists.

Inside this mansion turned museum, the works of prominent Croatian artists are on full display.

This modern, multimedia museum takes visitors on an evolutionary journey back in time.

Trimmed trees grow alongside the graves like topiary tombstones.

Just a few miles from Novalja, a strange geological oddity has left scientists baffled.

This beautiful Croatian fortress is haunted by legends of forbidden love.

This 135-year-old weather station studied the effects of the climate on human health.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.