300 Congress Street
The Computer Museum of Boston, the first of its kind I believe, closed in 1999. Some of its exhibits went to the Museum of Science in Boston and many of its artifacts went to the Computing History Museum in Mountain View, California. See link above for details.
1/01.07: For a while before it closed, however, there was a four-die penny machine in the lobby. If you know what happened to the machine, please send details.