I visited this WHS in June 2014. The mountain scenery alone is wonderful. However, walking uphill through the main gate, listening to the cattle bells echoeing in the valley, enjoying the wonderful breeze as you go from one quaint church to the next is definitely an experience nobody should miss when in the Peloponnese. My favourite churches with the best frescoes were the Agia Sofia and the Byzantine Metropolis Church. The view from the fortress/castle above is very worthwhile even though the Palace is under restoration at the moment.