On this Polish road, an optical illusion makes cars seem to roll uphill.

This fairytale medieval church in Poland originally spent centuries in Norway.

One of the world's largest collections of medieval religious art.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

An underground city of salt.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A muddy alien landscape that is home to rare species of exotic plants.

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

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

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Moss and stone turn this waterfall into an otherworldly liquid veil.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

The true meaning behind this sculpture remains unknown.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

A two-way chairlift system between Zugliget and the highest point in the city.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

A museum in the childhood house of a medical pioneer.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Museum dedicated to the terror regimes of Hungary.

Villas that once served as playgrounds for the rich now fall away in decay.