Post by Centaur on Nov 23, 2019 12:05:06 GMT -6
The Yerkes Observatory is in southern Wisconsin just north of the border with Illinois and Chicagoland. When it was opened in 1897 by the University of Chicago, it housed the world's largest telescope. Guided tours ended in 2018, but may resume soon.
Sky & Telescope - Yerkes
Sky & Telescope - Yerkes