This website contains collections of images from many different government agencies. For example, the National Parks Service, NASA, the U.S. Mint, branches of the Military, and many, many more. The photos could be very useful in Science, Social Studies, and probably other classes as well. From just some quick research, it looks like the collections of images might best be suited for middle and high school students. The website states that some of the images may be used without permission or fee but the user should read the disclaimers to make sure of the copyright status.

National Marine Sanctuaries Media Library contains photographs of marine life. The content of this website would best be suited for High School and Jr. High School science classes. One area of interest on the website contains images of the human impact on marine life which could be useful for an Environmental Science class educating students on the effects of humans on our environment. The collection found on this website contains still images and some videos. The website lists that permission is granted to "any and all users (public domain)" for "unlimited uses." The images also include descriptions of the photos to help the user better understand the purpose of the photo.

This website contains clipart of maps and flags. This resource could be particularly useful in a Social Studies classroom for just about any grade Middle School through High School. I imagine the resources being used by teachers for instruction or students to use to create presentations where they need illustrations about various countries. One stipulation listed on the website is that permission must be given in order to use the country maps. Other than that, most sections list that the user is able to use the images free of charge without any formal permission. They do ask that if you choose to use their images that give a link back to their website. I thought it was very useful that the Flag Images included commentary on the country to which the flag belonged and a reason for the flag being as it is.