A geothermal paradise with bubbling mud pools and bright blue hot springs.

A black sand beach where glacial fragments wash ashore and look like sparkling diamonds.

A little-visited waterfall in an otherworldly landscape.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.

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

This fantastical waterfall is hidden in a cave located in a cracked cliff.

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

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

The most powerful waterfall in all of Europe.

Rising from the sea like a stone monster.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

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

This 65,000-ton glacial boulder stands as a striking natural monument.

The world's northernmost aquarium looks like it has fallen over.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

One of the few Tudor palaces in Germany, which hosted a historic WWII meeting.

The "Prussian Versailles" that is as glorious today as when it was built.

A tree meticulously shaped and trimmed into the shape of an elephant.

The most visited, and possibly most controversial, museum in Germany.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.