With these do-it-yourself plans, you too can own a piece of history (cheap) ;)
The 1mhz Apollo guidance computer was the most advanced of it's time, and was key to the success of the first moon landing.
http://gizmodo.com/5319472/how-to-build-the-1mhz-apollo-guidance-computer-for-just-3000 (http://gizmodo.com/5319472/how-to-build-the-1mhz-apollo-guidance-computer-for-just-3000)