American Memory Project - Historical collections of images for the National Digital Library

Ben's Guide to U.S. Government - Information on U.S. Government

CIA World Factbook - Information on countries all over the world including reference maps

National Atlas of the United States - A reliable summary of national-scale geographical information

National Park Service - Reserve camping spots and learn the history about many national parks

States and Capitals - Information on the fifty states

World Mountain Encyclopedia - Explore the mountain ranges of the world