This former steel and coal plant is now a neon-lit industrial fantasia.

The world's first ice hotel is still one of the most elaborate and beautiful.

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

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

This plaque tells the story of an event that took place in an imagined parallel universe.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

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

The most powerful waterfall in all of Europe.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Medicinal spa created with the discharge from a geothermal energy plant.

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

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

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

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

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Experience a charming 1930's version of "infotainment."

Dramatic river bend surrounds a natural red-rocked pedestal.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.