Catherine Parker More than its star attraction (Old Faithful), the Upper Geyser Basin boasts not only the largest concentration of geysers in the park, but also in the entire world (Yellowstone is ...

Lightning strikes above the Fan and Mortar geysers in Yellowstone's Upper Geyser Basin. Geysers are formed when underground water meets superheated rock and blasts back out through a narrow hole.

Yellowstone National Park is a place where steam rises from the earth and geysers erupt like clockwork. Parameters were ...

The Lone Geyser Trail is in Upper Geyser Basin, about 3.5 miles south of the Old Faithful overpass on Highway 191. There are vault toilets available, though no other amenities, so hikers will need ...

which is the Midway Geyser Basin, where we find Grand Prismatic, and the Upper Geyser basin, which is where we find places like Old Faithful. - It's about 300 feet in diameter. It has a discharge ...

Eruption of Old Faithful, a geyser at Yellowstone National Park.. Credit: Yellowstone national park/Ranger bach The famed Old Faithful geyser erupts into a clear blue sky in a new video taken on ...