A tribute to a Ukrainian heroine who went undercover and killed several Nazi operatives.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

When you've got to go, you've got to go.

The deepest metro station in the world.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

340-foot statue built to honour the Heroes of the Soviet Union.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

This Ukraine alleyway has become its own little island of forgotten things.

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

This eccentric folly house was designed by Romanian thinker Bogdan-Petriceicu Hasdeu, with a helping hand from his deceased daughter's spirit.

17th century palace once a meeting place for politicians.

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

An abandoned saucer-shaped monument in the Bulgarian mountains.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

Resonant stone, that has been played since prehistoric times.

A shrine of fire worship built on top of a natural flame.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A medieval church built up to defend its village.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

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