These fragments (IX-6, VIII-5&6) from the Severan Marble Plan of Rome clearly show the Circus Maximus. All surviving fragments of the Map are now available at the Stanford Digital Forma Urbis Romae Project.
A draft of a circus programme also survives from Oxyrhynchus.
Brass sestertius of Titus, showing the Colosseum
Roman, AD 80-81, British Museum
The Flavian Colosseum was completed by Titus, and dedicated during his reign (AD 80).
This coin is part of a new British Museum online tour - Gladiators and Caesars, which deals with objects in the BM linked to gladiators, and to chariot-races.