Northern Europe’s largest castle ruins sit precariously on an island cliffside.

Nordic giants resurrected from the sea and restored to their former greatness.

The decaying remains of a 1960s mechanical wonderland that never officially closed.

This Denmark theme park is part family attraction, part experimental archaeology project.

The world's largest maze is a nature park with nearly 200 decision points.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

One of the world's largest amber altarpieces is housed within this reconstructed medieval church.

This formerly-prosperous Silesian mining town was completely demolished in the late 1960s and early 1970s as an attempt to cover up a secret Soviet uranium mine.

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

This enormous 32-foot painting depicts Poland's greatest medieval battle in glorious detail.

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.

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

Inside this Krakow church, an explosion of psychedelic color.

Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

This 13th century Gothic brick castle is the largest in the world by surface area.

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

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

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

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

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

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

These massive moving sand dunes have swallowed an entire village and are still on the run.