A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

Imperial palace of Emperor Galerius, the Emperor behind the worst Christian persecutions during the Roman Empire.

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

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

A giant portrait of an ancient king looms over the river.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

Check out engineering marvels of the past at this unintentionally retrofuturist museum.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

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

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

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

An homage to the medieval rulers of Bulgaria.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

This 13-foot smiling peanut in Georgia helped Jimmy Carter win the 1976 presidential election.

The former home of the hard partying literary power couple is now one of the only museums devoted to their story.

A wealth of local folk art, antiques, and curios, without ever leaving your car.

A former taxidermist has turned his old shop into a folk art mecca.

A 30-acre garden inspired by the principles of modern physics.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.