Mysterious meeting place for UFO hunters near Area 51.

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.

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

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.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

Every president in history is immortalized in bronze in downtown Rapid City.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

One person's lost luggage is another person's treasure.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

The ruins of this Alaska gold mine form a gorgeous ghost town.

Impressive artifacts from Juneau's gold mining days fill this mining site-turned-museum.

On top of a sheet metal business in Juneau stand nearly a dozen charming Wizard of Oz statues.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Hollowed out cedar log tubs set in an ancient towering forest.