Superscape 3-D Viewer...

http://www.superscape.com/Downloads.html

 The Superscape 3-D Viewer is a Netscape 2 plugin and allows you to view and
 interact with rich virtual worlds across the World Wide Web. You will need a PC
 running MS Windows (3.1x users see additional info) and Netscape's Navigator
 2.0. The 3-D Viewer installer is approximately 1.7 megabytes and requires 4
 megabytes of disk space for installation. 

Installation Instructions

   1.Select one of the Download links from above. 
   2.When the Save dialog appears select a directory to save the 3-D Viewer
      installer to. 
   3.When the file is downloaded, Exit Netscape. 
   4.Run the installer -- Windows 3.11 and NT - Program Manager > File menu
      > Run -- Windows95 - Start menu > Run. 
   5.When the installer is finished double-click on the "Superscape 3-D Viewer"
      icon in the "Superscape" program group. 
   6.Click on the globe to go to SuperCity.