A. The Colosseum.
B. Part of the Cœlian Hill, on which the Claudium stood.
C. Part of the Palatine Hill.
a. Summa Sacra Via.
a*. Clivus Triumphalis.
b. Meta Sudans.
c. Arch of Constantine.
d d. Passage of Commodus.
e. Site on which the steam-engine was placed in 1874-5, to pump out the water coming from this point.
f. Piscina of the time of Nero.