An Idaho legend carved out a cave village with his own two hands.

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.

Native Americans built this circle of stones, which was used to predict astronomical events.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

One man's ambition created this psychedelic log home.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

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

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

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

A beautiful geyser under environmental threat.

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

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

This amazingly preserved Gold Rush town is a historian's dream.

An entire town preserved as a historic landmark.

New fungal and bacterial species call this deadly lake home.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

See the computer’s history revealed over the course of 20,000 years.

Mining town from the late 1890s, once home to Calamity Jane.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

Submerged lava formations create incredible waterworks.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A Hawaiian stairway to heaven—that you can't climb.