S. NICHOLAS OF BARI.
Built by the Gaetani. Considerable remains of this fortress exist, showing the strength of the hold by means of which they levied "black mail" on the passers-by.
TOMB OF CECILIA METELLA.
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From this point the Via Appia continues in a straight line to Albano. Considerable remains of tombs exist on each side of the way, connected with which are many anecdotes and tragedies. Along the Via Appia a most magnificent prospect of the Campagna is enjoyed, with its ruined tombs and aqueducts, and the Sabine and Alban Hills in the distance.