Old Faithful Geyser, located in Yellowstone National Park, Wyoming, USA, is one of the world’s most famous geothermal features and a highlight of the Upper Geyser Basin. Visitors can watch its eruptions from boardwalks, viewing platforms, or the Old Faithful Visitor Education Center, which also provides predicted eruption times and educational exhibits. Notably, Old Faithful erupts every 35–120 minutes, reaching heights of 90–184 feet, and has inspired the creation of Yellowstone as the world’s first national park in 1872, while nearby landmarks such as the historic Old Faithful Inn add cultural and architectural significance to the site.