This page is still under construction
For a start you can check-out the Lonely Planet: https://www.lonelyplanet.com/iceland
These are the pages of the Iceland Institute Natural History (Museum). Over the years I have found the English internet pages of this museum quite disappointing. But let me not needlessly discourrage potential visitors. This is their URL.
For those able to understand the Icelandic language this site has a lot more to offer.