Geysir is a famous hot spring in Iceland's Haukadalur Valley, known for its geysers and hot springs. While Geysir itself is not very active these days, the nearby Strokkur geyser puts on a show every 5-10 minutes, shooting water up to 130 feet high. Visitors can also check out bubbling mud pots and fumaroles in the area. It's a cool spot on the Golden Circle route where you can witness some awesome geothermal action!