With 2000+ years of history to its credit, the Colosseum is no ordinary structure. Although the vagaries of time and weather have left their imprints on the monument, its greatness lies still unscathed. Several of its defining features still stand, like the arena (a wooden floor covered with sand) and the underground, a maze of tunnels and intricate lever systems.
Here are two maps you can use to enter the monument and navigate its insides.