Postcard Old Faithful geyser
Old Faithful is a cone geyser located in Yellowstone National Park in Wyoming, United States. Old Faithful was named in 1870 during the Washburn-Langford-Doane Expedition and was the first geyser in the park to receive a name.] It is a highly predictable geothermal feature; since 2000, it has erupted every 44 to 125 minutes. The geyser, as well as the nearby Old Faithful Inn, is part of the Old Faithful Historic District. UNESCO World Heritage Site.