Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park ... in Yellowstone. In samples gathered at Obsidian ...

At the National Historic Landmark of Obsidian Cliff, the molten lava that ... United States to sign a new law making ...

Artifacts found in Alberta have travelled between 400 and 1,200 kilometres, with the vast majority coming from Bear Gulch in Idaho and Obsidian Cliff in Wyoming's Yellowstone National Park.

From bison burgers to huckleberry margaritas, get ready to discover the must-try dishes and best places to eat in Yellowstone ...

Artifacts found in Alberta have travelled between 400 and 1,200 kilometres, with the vast majority coming from Bear Gulch in Idaho and Obsidian Cliff in Wyoming's Yellowstone National Park. Other ...