Connections Museum

The Connections Museum is located in Centurylink's Duwamish Central Office at East Marginal Way S. and Corson Avenue S. in Seattle's Georgetown neighborhood. It "reveals the history of the telephone and the equipment that makes it all work." The museum was originally sponsored by the Washington Telephone Pioneers, and is now a part of the Telecommunications History Group, based in Denver. It features vintage equipment from AT&T, Western Electric, Pacific Northwest Bell, USWest, and other organizations.

Source: Wikipedia