Monte Testaccio
He is best known for several books on Latin inscriptions, and he is the discoverer of the Duenos inscription in 1880 on the Quirinal Hill in Rome, one of the earliest known Old Latin texts, variously dated from the 7th to the 5th century BC. Dressel also developed a typology for classifying ancient amphorae, based on his pioneering excavations at Monte Testaccio in Rome.