Telescopes outfitted with modern electronic cameras and spectrographs\nare astronomers' primary tools for exploring the Universe. In this\nlecture I review the primary types of telescopes and the best\nobservatory sites to locate them, with a brief mention of radio and\nspace telescopes. At the end, I give a brief review of the Ohio State's\nobserving facilities. Recorded 2007 Oct 26 in 1000 McPherson Lab on the\nColumbus campus of The Ohio State University.