A summer eruption of visitors in Yellowstone encircles the rim of Old Faithful%2C waiting for the world%27s most famous geyser  to send its hot water plume skyward.  Photo courtesy National Park Service%252FNeal Herbert.
A summer eruption of visitors in Yellowstone encircles the rim of Old Faithful%2C waiting for the world%27s most famous geyser to send its hot water plume skyward. Photo courtesy National Park Service%252FNeal Herbert.