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

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

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

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

Boats must transform into railroad cars to navigate this Polish canal.

There are thousands of tributes and memorials to the King, but none quite like this one in a Kraków city park.

This imposing 20th-century castle was abandoned before it was ever completed.

A collection of old neon signs from all over Poland line a secluded courtyard.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

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 marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

Hundreds of boat-shaped headstones fill this graveyard as part of a centuries-old custom with mysterious origins.

300 years of pharmaceutical history on display.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

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

An industrial site turned into Hungary's most cherished natural wonder.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.