The limestone composition of this spectacular arch makes it unique to the region.

This ancient village provides insight into the complexity of the pre-Columbian Fremont Culture.

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

Just a man taking his prehistoric pet for a stroll.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.