Scronan: I was wrong. The intersection is on the level with all the crystals and the pentacle. Goes to show what several years of forgetfulness will do to a brain! What I was remembering is that the level where the huge room with the spinners is located is how you get back to that corridor quickly.
(MAP OF HALL OF THE PAST BELOW):
Look at the map segment surrounded in red. Where the red asterisk is located is the "Fight Respawn" square. To get back to it, go north, then east, to FF. It will teleport you to the level surrounded in blue. Go west from ff, and south, and enter the gate to the east of (7). Step inside the gate at DD, and you'll be transported back to dd on the Respawn level. Exit the room and back to the red Asterisk. Fight, and repeat.
Hope this helps!
-Sazerac