They have a page similar to Celestrons. While its basically the same information, some of the emphasis is different. Western Observatorium is an astronomy club in southern California. They also provide basic information on telescopes. This page describes the basics of how telescopes work, how to design and build one.
Site is the homepage for the world's most powerful ground based telescope.
Look in General Information to find out more about the special features of this telescope. Site is the homepage for the National Optical Astronomy Observatories which runs many of the most powerful telescopes. Be sure to look under tourist information, current science, and education. Site is the homepage for the Hubble Space Telescope and describes not only the telescope itself, but the latest research findings. Also, look under the educator resources.