Lacus Curtius: A superlative site for geographical information and English translations of important Latin and Greek writers.
Film and Television:
Rome: HBO's watershed program covers the collapse of the Republic and the rise of Imperial Rome. The story plays with history, but the visuals are extraordinary.
Spartacus: Blood and Sand: Spartacus, and its miniseries successors, shows the political divisions and violence in the legendary civil war period that preceded the Empire.
I, Claudius: This 1976 series has its flaws, particularly in the depiction of Empress Livia, but contains an outstanding theatrical presentation of vicious imperial Roman politics. Emperor Claudius is early into his reign as the game begins.
Gladiator: Russell Crowe's gladiatorial biopic shows the decline of the Imperial golden era, but the breathtaking visuals and social friction are well worth the time.
3D Roman Buildings: Models of some of the best known Imperial and Republic buildings in Rome.