Geysir

I went on the bus trip for the Golden Circle which encompasses the geothermal springs at Geysir (hence the name for a hot water tap), the waterfall at Gossfull, which I never visited because conditions were treacherous underfoot, finishing at the site of the old Icelandic parliament at Pingvellir (or Thingvillir). Which also happens to be the site if the mid-Atlantic Rift on land.