The chariot races in the hippodrome started from this building at its northeastern end, of which nothing is visible today. It had twelf boxes, one for each chariot, with doors that were opened all at the same time by a mechanical device when the race begun. The famous horses that are now at San Marco in Venice until 1204 stood on the outer facade of the hippodrome boxes.

Quadriga horses. (I think the city of Venice should produce four more replicas of the horses and present them to people of Istanbul.).