One man's ambition created this psychedelic log home.

The first declared National Monument in the United States.

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

An architect's childhood fantasy treehouse made real.

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.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

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

A sprawling museum located on the former site of the Orphan Girl Mine.

The highest point in Montana is as rugged and singular as the state itself.

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

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

The only road through the heart of Glacier National Park.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

New fungal and bacterial species call this deadly lake home.

A remarkably well preserved tower dating all the way back to the Iron Age.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

This crumbling folly looks like an enchanted left over from Middle Earth.

Largest lake in Great Britain measured by surface area.