As an educator, I am committed to sharing the best of the web resources with my students. Here is a partial list of essential websites that my class cannot live without. I am partial to those sites that provide primary sources in a kid-friendly presentation. Location matters, too, so I support those museum websites that we actually frequent often in person (easy to do when located in DC). Many museums offer excellent online educational resources and lesson plans for teachers.
Please enjoy. These are just the tip of the iceberg: