He completed the public works which had been half finished under Tiberius, namely the temple of Augustus and the theatre of Pompey. He likewise began an aqueduct in the region near Tibur and an amphitheatre beside the Saepta, the former finished by his successor Claudius,” while the latter was abandoned. At Syracuse he repaired the city walls, which had fallen into ruin through lapse of time, and the temples of the gods. He had planned, besides, to rebuild the palace of Polycrates at Samos, to finish the temple of Didymaean Apollo at Ephesus, to found a city high up in the Alps, but, above all, to dig a canal through the Isthmus in Greece, and he had already sent a chief centurion to survey the work.