What color is the Roman coliseum?

Answer 1

The colour of the outside of the Colosseum is a mostly a whitish with a yellow hue with some areas which are brownish. The latter is a discoloration of travertine, the stone which was used to make the outer coating of the structure. Travertine is whitish with yellow or reddish hues. Travertine was used for main pillars, the ground floor and the external wall. The shell of the Colosseum is concrete.

Answer 2

The Roman Colosseum is brown and grey.