One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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.

The first declared National Monument in the United States.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

A giant Troll lurks under one of Seattle's oldest bridges.

The eerie ruins of a remote abandoned hamlet said to be founded by the survivors of a shipwreck.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

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

This quiet park's strange sedimentary spires were named after Kodak's color film.

The fifth-longest natural arch in the world, and the longest outside China.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

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.

A curious cone-shaped structure made of wire and covered with antlers.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

This grimly-titled Texas cemetery is all that remains of a Wild West settlement with possibly the worst name.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.