The Curia is the largest brick building that still has a roof in the Forum. It was the Roman Senate building and it is believed that it was constructed by Tullus Hostilius. The building was a church until 1937, when the fascist government had interior removed and the original interior exposed. What is left today of the ancient senate building is the original marble floor made out of Egyptian marble. Also, the tiers that held the seats of the senators remain.