Four alabaster giants contemplate the tides on the shore of Denmark.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

This man-made mound monument was built out of soil from all across the Polish empire.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

An extensive network of secret tunnels was created for the Nazi project "Riese."

Naturally formed rock city in Poland.

Enormous sandstone towers loom within a Czech forest.

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

The giant metal fruit was once the symbol of a large farm.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

France's high-tech, future-themed amusement park.

Explore an eerie, abandoned medieval citadel.

The largest underground church in Europe.

Old vessels have been transformed into artistic canvases in this unusual cemetery.

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

This bone-filled cave got its name after they found 140 bear skeletons inside.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

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

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

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

A small town Romanian cemetery filled with darkly humorous gravestones.

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