Some of the coolest things can be found by getting down to the ground and taking a close look at the tiny things that make up our natural world. The Hidden Forest aims to help you identify all the mosses, liverworts, and bryophytes you might come across.
Unlike other very good nature I.D. sites (such as What’s That Bug?), The Hidden Forest gets all geeky and delves into the classification names and lineage of the different plants. (If you’re into fungus, this is the site to visit.)
Right now, much of the content is centered on New Zealand flora, but there are plenty of US equivalents. You can spend time outdoors with your kids geocaching or animal tracking, or you can now go mold hunting.