Yerkes Observatory

Williams Bay

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In a Nutshell

Daytime guided tours of Yerkes Observatory interior and exterior focus on architecture, including intricately carved columns and a dome

The Fine Print

Promotional value expires May 13, 2016. Amount paid never expires. Younger than 18 must be accompanied by guardian. Subject to availability. Limit 1 per person, may buy 1 additional as a gift. Valid only for option purchased. Valid only for weekday tour times posted on the website. Not valid on day of purchase. Must use promotional value in 1 visit. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

Choose from Three Options

  • $11 for a weekday daytime tour for two ($20 value)
  • $21 for a weekday daytime tour for four ($40 value)
  • $31 for a weekday daytime tour for six ($60 value)

Daytime tours of Yerkes Observatory allow groups to admire the building’s beautiful and unique interior and exterior Romanesque architecture, including the 90-foot diameter dome containing the world’s largest refractor telescope.

Yerkes Observatory

The Yerkes Observatory is determined to explore as much of outer space as possible from here on Earth. The 77-acre observatory, built in the 19th century and considered the birthplace of modern astrophysics, sits in a park-like setting near Geneva Lake in the village of Williams Bay, Wisconsin and is owned by the University of Chicago. The Observatory continues to be a center for scientific and engineering research, teaching, and public outreach. The Yerkes Tours staff hosts daytime building tours for all ages along with evening observing tours where visitors aged 10 and up can view celestial objects with the facility's 24-inch reflector or 40-inch refractor.

Customer Reviews

Interesting tour. Impressive facility.
Bill B. · May 7, 2016
Tour guide was great! Very informative! Great tour!
Mary S. · April 30, 2016
The guide was very knowledgeable and the tour was very interesting!
David A. · April 29, 2016

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