Tuesday-evening loop on north Penteli under the full moon: a climb through the forest past small chapels to the old quarry buildings, the open-air Museum of Quarrying Art and the marble sculpture park, with views over Attica, Marathon and Evia. +280 m, about 2.5 h with stops, grade 1-2 (easy-moderate). Meet at 19:30 in Drosia (near Dionysou Ave); the hike starts strictly at 19:45. The exact meeting point is sent 2 days before. No coach: come with your own transport. Bring a head torch. Full refund for cancellations up to Friday 20 November 2026. Included: experienced escorts certified in first aid, group first-aid kit, liability insurance and taxes. Bring hiking boots (required), clothes for the season, a windproof/waterproof jacket, a backpack, at least 1.5 litres of water, snacks and a change of clothes and shoes for after the hike. Ages 10 and over (10-17 with a guardian). Info and bookings: info@wade.gr, +30 211 214 8254 (Mon-Fri 09:00-17:00).