A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Idol made by King Jeroboam for the Israelites.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

Over 315,000 preserved amphibians and reptiles in jars.

Northern Ireland's Brobdingnagian stepping stones.

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

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

Massive rock sculptures formed during the time of the dinosaurs still stand undisturbed.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

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

In which a local geological marvel becomes a quaint roadside attraction.

The first declared National Monument in the United States.

Towering basalt columns, a creation of fire and ice.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

Potential high level nuclear waste storage site for the next 10,000 years and beyond.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Curious rock formations in a tiny Kansas state park.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

Burping, gurgling geothermal mud pots by the Salton Sea.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

The oldest still-existing mosque in the United States sits in a remote prairie in North Dakota.