First go to the North-East, leaving the Cathedral behind you. You will come to a small square, an important testimony of the millenary past of Palermo.
If you turn your gaze to the Cathedral, you will see one of the few parts that have been preserved of the building built by the Normans with Arab workers.
Only three of the four images below show some details of the apses. Try to guess the intruder to continue.
Click on the intruder!