Be initiated into the ancient mysteries of the Cult of Mithras.

Your clue for the sixth location:

Our tour now takes a brief detour over the river and back (the trail doubles back on itself so this stop can be skipped if you prefer less walking). Cross to the south side of the river and find the oldest theatre you can think of. No, not the famous one. There's another even older theatre hiding in the Globe's shadows. Can you find it?