The brick building called the Temple of the Divus Rediculus stands half a mile to the left of the road at the second milestone in the Caffarella valley. The legend which connects it with Hannibal’s march on Rome is altogether unworthy of credit,[129] and it is plain that the building, which had no rows of surrounding columns, but is constructed with Corinthian pilasters, had two stories, and cannot therefore have been a temple. Professor Reber considers that it was a chapel tomb similar to that to be seen further on the road at S. Urbano, near the Tomb of Cæcilia Metella. [Sidenote: Grotto of Egeria.] The Grotto of Egeria, as it is called, lies in the valley of the Almo about half a mile above the building just mentioned. It is an arched nymphæum of brick, at the back of which a plentiful stream of clear water issues. The mutilated statue of the nymph still remains, but no other parts of the decorations. There is little doubt that it was the nymphæum of some suburban villa. [Sidenote: Temple of Bacchus or Honos.] On the hill above it stands the Church of S. Urbano, probably an ancient tomb in the shape of a chapel. It is commonly called the Temple of Bacchus from the discovery under it of an altar of Dionysus with a Greek inscription. But this altar seems to have been moved here from some other spot. The building is in the form which has a projecting porch with four Corinthian columns and capitals. These are now built up into the modern wall. The whole, except the entablature and columns, is of brickwork of the Antonine era, as appears from the stamps of the bricks. The triple frieze, forming a kind of attica between the architrave and cornice, seems to contradict the notion that this was a temple, though the great antiquary E. Q. Visconti considered that it was the Temple of Honour built by Marius outside the Porta Capena.[130] The interior is tolerably well preserved, and has a vaulted roof with coffers and reliefs in the form of trophies. [Sidenote: The Circus of Maxentius and Temple of Romulus.]