Somewhat misleading, the main attraction at Geysir is not actually Geysir, but Strokkur. Both are of course geysers, derived from the Old Norse 'geysa', meaning 'to gush'. While Geysir is very irregular and much smaller than it once was, Strokkur erupts like somewhat unreliable clockwork (every 4-8 minutes or so) to an impressive height of almost 20 m. And there is no way to adequately describe how cool it is to see a geyser erupt from just a few metres away. It’s worth walking around the Geysir area for different views of the erupting Strokkur and bubbling, boiling water in various other holes and crevices. Geysir is one of the busiest tourist sites in Iceland, and part of the Golden Circle tourist route, so expect big crowds throughout summer. Visiting during the light summer nights is a great alternative for anyone wishing to experience this wonder of nature without the throngs of other visitors, although you would have to do without the souvenir shops and restaurants. Crowds or not, though, this is one attraction you simply cannot miss!