Leaving the arx on the left, we reach by a long flight of steps the greatest of all Roman temples, placed on a long platform with solid substructures of Etruscan workmanship, part of which is still to be seen in the garden of the German Embassy.

Possibly it stands over an immense substructure, in which may yet be found the lore of ancient Egypt; it may even prove to be the famous labyrinth of which Herodotus speaks, built by the twelve kings of Egypt.