An abandoned saucer-shaped monument in the Bulgarian mountains.

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

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

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

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

A spooky spot along the road where things mysteriously seem to move uphill by themselves.

A medieval church built up to defend its village.

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

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

This snug medieval lane is one of the narrowest streets in the world.

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

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

This Transylvanian church has changed its denomination four times.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

The abandoned military base looks like a post-apocalyptic wasteland.

Central Europe's largest collection of mini-bottles is on display at this museum devoted to a bitter Hungarian liquor.

A unique hotel for the artistic soul.

This hidden art nouveau gem was designed by an architect in search of a national style.