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

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

This functioning mill was built in the 1970s using parts from several other West Virginia mills.

The world's largest fully steerable radio telescope.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

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

Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Fossils, railroads, and waterfalls!

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

An abandoned faux-pub made famous by a Guinness commercial.

The highest point in Washington state is a volcano covered in glaciers.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

"Gnome Chomsky" was once the largest gnome in the world, but is now simply tall for his kind.

Stroll through a wonderland of stupendous moss-covered trees.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

These caves are home to a small church and were used to age cheese.

Reforestation in action is the main attraction in this abandoned quarry.