What was the arena floor of the Colosseum primarily made of? The Colosseum’s arena floor was primarily made of wood.
The arena was a wooden platform covered with sand. The Latin word for sand, harena, is the source of the modern word “arena.” This surface gave gladiators, animals and performers a workable stage while helping absorb blood and other fluids during spectacles.
Beneath the wooden floor was the hypogeum, a subterranean network of tunnels, rooms and cages. It held gladiators and animals before they entered the arena, while lifts and trapdoors could bring people, scenery and animals up into view. Emperor Domitian later ordered major underground construction that made the hypogeum especially extensive.
Travertine, concrete and marble were all used elsewhere in the Colosseum, so they are tempting alternatives. Travertine formed much of the outer structure, while concrete and marble appeared in foundations, vaults, seating and decoration. They were not the primary material of the arena’s actual playing surface.