Aphrodisias. Turkey. View of an athlete’s entrance tunnel of the stadium, which is the largest and best preserved stadium in the ancient world. Dating from the 1st century AD, the stadium is some 270 metres long (900 ft.) and it’s almost complete stone marble seating held more than 30,000 spectators. It was mainly used for athletic com competitions and athlete’s entered the arena via tunnels at each end of the stadium.