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

Hamburgers are intensely proud of their tunnel beneath the river.

The prototype for all Nazi concentration camps.

A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

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

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This former steel and coal plant is now a neon-lit industrial fantasia.

The world's first ice hotel is still one of the most elaborate and beautiful.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

This plaque tells the story of an event that took place in an imagined parallel universe.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The most powerful waterfall in all of Europe.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Walk in the footsteps of the gods and straddle two tectonic plates.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."