A 3D model of the Colosseum would depict a massive, elliptical amphitheater with multiple tiers of arches and columns, forming a layered structure. The outer walls would feature repetitive, evenly spaced openings, representing the iconic Roman arches. Inside, the model might showcase the intricate details of the seating area, the arena floor, and the underground hypogeum system, with its tunnels and chambers. The design would reflect both the grandeur and the weathered, ancient look of the Colosseum, capturing its historical and architectural significance.