This exhibit is my favorite and I have gone multiple times and always learn something new! You'll be surprised at how much you love this place!
It's easy to spend hours here. You can drive a few minutes out of downtown to Perlan. There is a museum inside called the Wonders of Iceland. You learn a lot of the geological history of Iceland, explore an Ice tunnel, and even can watch an amazing northern lights video from the dome planetarium.
There is also a viewing deck over all of Reykjavik and a nice cafe on the top floor.
Perfect for all ages! Even kids!