Euryalus Castle, high above the Sicilian city of Syracuse, was the strongest and most sophisticated fortification anywhere in the ancient Greek world. The Strongest Ancient Greek Castle | 8:35 Toldinstone Footnotes | 42.4K subscribers | 3,851 views | June 24, 2025 Chapters 0:00 Introduction 0:35 Outworks 1:37 Tunnels and galleries 4:38 Keep 6:37 Outer courtyard 7:48 Walls of Dionysius