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

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

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.

An abandoned saucer-shaped monument in the Bulgarian mountains.

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.

This only museum in the world dedicated solely to mushrooms.

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.

A peculiar museum that includes many drunken tales, a drunk driving simulator, and much more.

A self-proclaimed libertarian micro-state on a tiny bit of disputed territory between Serbia and Croatia.

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

Dive for drinks at Croatia's first and only underwater winery.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.