These rare statues are one of the few remaining material witnesses to Old Prussian culture.

This mysterious and once-grand memorial still embodies a remarkable architectural vision.

A statue honors the children who fought Nazis in Poland.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

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

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

A peculiar family mausoleum built by a German nobleman captivated by the occult.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

Museum dedicated to "the man who moved the Earth."

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

Naturally formed rock city in Poland.

Warsaw's fantastically preserved gasworks...almost.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The site of the first battle of World War II.

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

This Polish cave has housed a dragon, a brothel, and an enduring legend.

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.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.