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

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

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

A beautiful geyser under environmental threat.

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

Dig for your own trilobites in this goldmine of invertebrates.

Largest man-made excavation on earth!

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

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

"Only the devil could play golf here."

This massive redwood tree has a hole in the base big enough to drive through.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.