The censor Appius Claudius Caecus builds Rome’s first aqueduct, the Aqua Appia, which runs almost entirely underground. 144 B.C. Work begins on Rome’s longest aqueduct, the 56-mile-long Aqua ...

among them the Segovia Aqueduct in Spain and the Aqua Appia in Rome. As it was discovered within a protected monument zone listed on the UNESCO World Heritage List—namely Gerulata, a 2nd-century ...