Telescopes outfitted with modern electronic cameras and spectrographs

are astronomers' primary tools for exploring the Universe. In this

lecture I review the primary types of telescopes and the best

observatory sites to locate them, with a brief mention of radio and

space telescopes. At the end, I give a brief review of the Ohio State's

observing facilities. Recorded 2007 Oct 26 in 1000 McPherson Lab on the

Columbus campus of The Ohio State University.