There are old and modern maps online, and not just for Massachusetts, that I heard about from Rootsweb Review, 23 May 2007, Vol.10, No. 21. I also was enjoying looking at some c. 1630 and 1975 Irish maps. Norman B. Leventhal Map Center at the Boston Public Library This website contains more than 200,000 historic maps and 5,000 atlases, including woodcuts, copperplate engravings, lithographs, and more. Maps come from all over the world, though the majority are from Europe and America, with a particular focus on New England, Massachusetts, and Boston. They date from the fifteenth century to the present day. http://maps.bpl.org/