There is a wonderful collection of old maps online at the Jewish National and University Library.
The late Eran Laor, author of Maps of the Holy Land (1986), donated his entire collection to the library in 1975. This collection of ancient maps is part of a much larger collection including ancient maps of the world, early printed atlases and travel books.
The site is searchable by name, place, year and other parameters.
In addition to the map images, the site offers many links to other major map collections of the Holy Land and the world.