The Piazza del Campo is the site of a famous biannual horse race, the Palio di Siena. The historic course is used in "Gran Turismo 5" in its new kart racing mode, controversially using the same flags that represent each district/competitor in the horse race. Apparently the flags and symbols are the only controversial component, so hopefully they can be removed or have the issue otherwise resolved without further delaying the near-vaporware racing game's release in November.
[via Kotaku]