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

Macabre astrological automaton clock dating to the late 1400s.

An elevator into the Baltic Sea.

An otherworldly, fossil-rich cobble beach holds Viking graves, cairns, and other remains.

Crooked windswept pines give this old forest an enchanted and magical look.

Archaeologists are still unraveling the secrets of the brutal massacre that wiped out this ancient fort.

Hundreds of mossy stones engraved with bits of philosophy, literature and random musings.

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

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

The world's only above water sand volcano, believed to once be the bathtub of a priest.

These mysterious circular formations are actually remnants of 19th century gristmills.

Hamburgers are intensely proud of their tunnel beneath the river.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

One of the world's heaviest musical instruments towers within a popular urban park.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

One of downtown Berlin's last reminders of its Communist past.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

A stunning Victorian abbey and walled garden on a lakefront.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This strategic isle was once swapped between empires and almost entirely destroyed in a bomb explosion.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.