The Atlas of Ancient Geography by Dr Samuel Butler was published in 1851, so no doubt it is obsolete for serious academic purposes, but I have yet to find a classical text, or classical scholar, that it couldn't illuminate. From Homer's Iliad, to Livy's or Mommsen's History of Rome, the maps below, downloaded to my desktop and tablet, are always helpful in understanding what's going on.
The files are hosted at the University of Texas Libraries, The University of Texas at Austin, who are be it noted, seeking donations to upload many other maps from the Perry-Castañeda Library Map Collection - a very worthy cause.
Africa (3.2 MB) | Armenia, Colchis, Iberia, and Albania (3.2 MB) | Asia Minor (3.9 MB) | Britannia (3.7 MB) | Egypt (3.3 MB) | Orbis Veteribus Notus (Europe, Asia and North Africa) (3.5 MB) | Gallia (France) (4.0 MB) | Germany (3.4 MB) | Greece and Islands (3.6 MB) | Greece and the Peloponnese (4.3 MB) | Greece and the Peloponnesus, South (3.8 MB) | Islands in the Aegean Sea (4.5 MB) | Italy, Central (3.8 MB) | Italy, North (4.1 MB) | Italy, South (3.7 MB) | Macedonia, Moesia, Thracia, and Dacia (4.1 MB) | Mauritania, Numidia, and Africa (3.2 MB) | Oriens (Persia) (3.6 MB) | Palestine, Times of Christ and His Apostles (3.7 MB) | Palestine, Times of Judges and Kings (3.2 MB) | Rome (3.9 MB) | Spain (3.9 MB)
Syria, Mesopotamia, and Assyria (3.0 MB) | Vindelicia, Rhaetia, Noricum, Pannonia, and Illyricum (3.0 MB)