Nestled within a German forest is an intriguing, growing rock.

Germany has its very own Centralia, whose spark remains attributed to "spontaneous combustion."

Nestled on the banks of a river in Nuremberg is a small museum that was once home of the city's official executioner.

Take a walk in a recreation of ancient Rome.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

This East German military command bunker was ready for World War III.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

Retirement home for giant obsolete machines.

A former ironworks that was the first UNESCO industrial site.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

These 18th century gardens tell a rocky story of the son of Odysseus.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

Ruins of a German Castle on top of a towering stone pillar.

The fairy tale castle of the "fairy-tale king."

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.