The U.S. Army topographical maps are some of the best maps I have ever come across online. All maps are 1:250,000, and there are enough maps to keep your download manager busy for most of the day. All maps are zoomable to very high degrees of detail.
The maps were drawn postwar, but they are based on WW2-era-data, save for some oceanographic data which is not likely to have changed anyway.
Just to give you an idea of the scope and breadth covered by these excellent maps, here is the index of areas covered by the P502 series:

There are also a few 1943-vintage Libyan town maps of Derna, Homs, Misurata and Tripoli here.










