Take parents who like to use the Internet, are interested in history, and have lots of memories from earlier times in their lives, on a visit the American Memory Project.
This amazing site at the Library of Congress has digitized exhibits — pictures, postcards, letters and music, and much more. Browse the collection by such topics as sports, religion, maps, and literature, to name just a few (see list graphic of collections from the LOC website).
The site is easy to navigate, and by clicking on the “list all collections” button in the right corner (on the site, not on the image to the right), a user travels to a huge alphabetical list of topics. The library is constantly digitizing and adding to its collections, so returning to the site frequently is a must.