The most famous and important monument, the starting and ending point of every sightseeing tour is the Amphitheatre, popularly called the Arena of Pula, which was once the site of gladiator fights. It was built in the 1st century AD during the reign of Emperor Vespasian, at the same time as the magnificent Colosseum in Rome. It is believed that the Amphitheatre could seat about 20,000 spectators. Local limestone was used for its construction. In the Middle Ages it was the site of knights tournaments and fairs. Today it is the venue for summer performances - the Film Festival, Opera Season, Equestrian Festival, concerts, which can seat about 5,000 spectators. The underground passages, once used by the gladiators, nowadays host a regular exhibition of viticulture and olive growing in Istria in ancient times.The Amphitheatre is situated outside the old city walls because of its size and geographical configuration. The road that leads to the centre was constructed during Emperor Vespasian, after whom it was named - Via Flavia. Even today it represents one of the main city roads.