CIRCUS OF MAXENTIUS,
erected A.D. 310, the enclosure walls of which have been preserved almost entire. These display the interesting phenomenon of pots of earthenware built into them, which not merely expedited the progress of the work, but allowed of its being more easily repaired than was possible in any other mode of construction. Its length was 1574 feet, and breadth 269, and 18,000 spectators could be accommodated within its vast walls, yet it was a small building compared with the Circus Maximus (see [page 209]). In 1825 three inscriptions were found proving this to be the circus consecrated to Romulus, son of Maxentius. Two towers flank the entrance, supposed to have been the seats for the judges. It is the most perfect specimen of a Roman circus remaining. On the top of the hill is the "stern round fortress of other days," known as