Geysir is a volcanic site where you get to admire the amazing spectacle of a superb geyser erupting at an almost clockwork-like frequency of once every five to ten minutes. In fact the generic term 'geyser' actually comes from this very site.
With the original Geysir itself now extinct, however, it is today its little brother Strokkur that is now the focus of all the attention. I found this natural spectacle endlessly fascinating, and it will probably have you holding your breath in excited anticipation right up until the final second just before the explosive eruption. "I wonder when exactly it's going to happen?" you will be asking yourself.
The pools of boiling mud and sulfurous fumaroles there are located all around the site add even further to the spectacle.
I really enjoyed my visit here; and the geyser is wonderful to photograph, providing you have enough patience and you manage to press the button at the right moment!
The only small downside is that this is one of the most popular places in the country with tourists, and there are large numbers of coaches bringing a constant stream of visitors here in summer. I therefore recommend visiting in the late afternoon, when the site is bathed in the golden light of the setting sun.