A matte painting of Starbase 11 as shown in the beginning of the two part wrap around TOS episode The Menagerie. Another Albert Whitlock painting. This Starbase was mentioned in two episodes, The Menagerie and Court Marial, though the details shown and the sky are quite different in both treatments. They were later harmonized to some extent in the CGI remasters.
See the live action set that the actors stood in front of here (which
was basically only the wall and sculpture):