The original attack periscope from a 1940s navy submarine towers high at this memorial site.

This 86,000-square-foot artwork is the largest mural in the world to cover a dam.

The longest timber-piled jetty in the world has an underwater observatory.

This watchtower once presided over the Berlin Wall.

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

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

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

A small man-controlled waterfall powers an Art Nouveau elevator and is accessed via narrow gauge, solar-powered tramway.

Over 12,000 hygiene oriented objects and exhibits.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

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

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

This black church sits alone among a field of lava rock.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

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

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

Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

The most powerful waterfall in all of Europe.

In Northeastern Iceland lies something of an oxymoron: a steaming desert.

A sulfuric martian landscape that looks far better than it smells.

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

This elegant arc of a waterfall marks a religious turning point.