Not surprisingly, Harvard University has one of the largest map collections in the United States, with over 500,000 items. While not all of these items have been digitized for this site, visitors can take advantage of hundreds of the items here. First-time visitors should read the "Introduction" area and then browse through some of the map indexes. The site also includes technical information on the collection, and a selection of "Search Strategies". Some of the maps here document 17th century London, maps of the Revolutionary War, and towns in Massachusetts. The detailed search engine allows users to search by collection, keyword, and those records that have digital objects. Finally, the site also includes links to the Harvard Geospatial Library and the Harvard College Library.