The mosaics and sculptures from the House of the Faun in Pompeii. Think of these as the ultimate jigsaw puzzles for archeologists. A selection of still lifes, aquatic life mosaics, as well as a complex battle scene between Alexander the Great and Darius. The artistry is truly astonishing. If you enjoy humor as well as beauty, I'd also recommend "Journal of Alexander the Great" by Henry Livingston (1793), which describes what REALLY went on in that very battle.