A winding, blood-red tunnel of hardened lava navigable by foot.

The most powerful waterfall in all of Europe.

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

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

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

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Climb right into the heart of this colorful Iceland volcano.

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

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

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

Rising from the sea like a stone monster.

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

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

This modern monument to pagan belief looks like it was transported straight from ancient times.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Enter this small nook and you'll be surrounded by 360 degrees of street art.

A poetic monument to the Scottish Parliament.

A medieval device used to punish and shame wrongdoers still hangs outside the village church.

The artwork mysteriously appeared within an Edinburgh cemetery.

This enormous, elaborate tomb looks oddly out of place next to a suburban Edinburgh bowling club.

A pair of stones embedded in an Edinburgh street memorialize one of the city's last public hangings.

A sea cave with a waterfall and Viking past

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

Nestled atop a wind-swept crag in the Scottish Highlands is a lonely memorial to a beloved hiker.