Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

This house's itty bitty size means no humans allowed.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Pick up this rock and become an instant legend.

Once the site of a 12-century monastery, this tiny island is now home to only five permanent residents.

Europe’s most powerful hot spring supplies the surrounding region with hot water.

On an island south of Iceland, a large volcanic rock formation resembles an elephant.

This canyon is comprised of gorgeous waters and magnificent basalt columns.

A modern Nordic Pompeii on the Icelandic island of Heimaey.

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

An Icelandic island full of diving birds and legend.

Outlaws, hot springs, and tragedy have all left their mark on this ancient road in the Icelandic highlands.

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

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

A giant concrete orb in far north Iceland marks the ever-shifting boundary.

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

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.