Beneath the Pendentive Bay                             -      N      - 
(-------------------------------------------------)     - <---(M)---> E
                                                        -      S      -

The rich detail in the moldings of the pendentive bay is enhanced by the
contrast of colored stone, which gives a peculiar crisp and vivid sparkle to
the interior.  An incredibly significant statue of the tetrarch Caracalla
stands against the west wall.  Other elements you notice as you slowly
proceed are the four large buttresses to your north, supporting the
impressive central dome that rests above them.  You are motivated to
continue north, to the tetrarch chamber.