Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

Oregon's unexpected high desert, displaying layers of time in a colorful show.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A modernist landscape of water and sci-fi concrete.

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

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Tubing through a cave lit with glowworms is a magical underground experience.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

The magical, mossy forest that inspired Princess Mononoke.

Stunning wetlands ablaze with pink lotus flowers.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A fiery crater has been burning in the Karakum Desert since 1971.

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

Experience park where visitors are told to expect the unexpected.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.