A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

A Saxony castle houses one of the largest and most outstanding mineral collections in the world.

This stone amphitheater was once part of Nazi Germany's plan to promote propaganda.

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

The oldest trees in Northern Germany.

A modern museum dedicated to the fairytales and dictionary work of the Brothers Grimm.

An ancient pagan site swirling with legends in the foothills of Franconian Switzerland.

This wooden hotel is a temple to German sustainability and forest conservation.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This historic California cemetery holds the bodies of veterans of both the Civil War and the Donner Party.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Exotic feline breeding compound and conservation center.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

The site of murders and Satanic cult gatherings.

The remains of the first punk club in L.A.

This grand mansion has starred in everything from Bones to Buffy.

A meditative space out of a fantasy story.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.