The word 'geyser' came from Iceland - that, in fact, is the name of the Iceland's biggest geyser - Geysir.
There is a hot springs valley with pools of simmering or actively boiling water.
Among them is Geysir that shoots up about a dozen times an hour to a few stories' height. Quite an amazing sight. Too bad it was so overcast - it is harder to grasp the enormity of it.
Video and more pictures in my English blog