Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

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

This highest peak in Idaho can only be reached by traversing a formation known as "Chicken-Out Ridge."

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

A beautiful geyser under environmental threat.

A miraculous natural phenomenon known as "the spring that breathes."

Home to the deepest rift anywhere on Earth.

These century-old beehive-shaped kilns were built to produce charcoal for nearby mines.

Home to a timed geyser created by complete accident.

An architect's childhood fantasy treehouse made real.

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

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.

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

A creek tumbles over a series of step-like rocks to create this scenic water feature.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

Armenian monks at an island monastery in the Venetian Lagoon make a rare rose petal jam.

Sitting atop a rock on Michamvi Pingwe beach, this restaurant becomes its own island at high tide.

Bits of flat terrain surrounded by cliffs make one of the most beautiful landscapes in the Azores.

Largest man-made excavation on earth!