Other Observatories with Virtual Tours

Kuiper Airborne Observatory (KAO).
Mt. Hamilton and Lick Observatory (University of California Observatories). Uses XPLORE, a new virtual tour interface, sort of like interactive fiction.
Mount Laguna Observatory (San Diego State University) Walking Tour.
Mt. Wilson Observatory. Lots of image maps.
National Solar Observatory/Sacramento Peak. (APO's neighbors!)
McDonald Observatory (TX). See also the Visitor's Center.
Whipple Observatory on Mt Hopkins. (Harvard-Smithsonian Center for Astrophysics.)

If you know of a virtual tour that isn't listed here, please email me at webmaster@astro.uchicago.edu!