Yerkes Observatory has been a hub for research and education since it opened in 1897. The Williams Bay facility sits on a 70 acre site adjacent to Geneva Lake and is home to the world's largest refracting telescope. The observatory has been restored and is open for tours begining in the Spring 2022.

During the tours, the guides provide a brief talk on the history of Yerkes, the architecture, astronomical research and the universe. Throughout the years, many notable scientists have worked at Yerkes or with collaborators here, including Albert Einstein and Edwin Hubble. The observatory is open daily from 9am to 5pm with tours being offered throughout the day Thursday through Monday. Check their website for details.