In the end of 1st century AD Philipopolis obtained a new urban development plan and center /Forum/ following a Roman model. The Forum complex, parts of which can be seen today on both sides of the Central Post Office, is the largest in Bulgaria. In the northern part of the forum complex is situated the Odeon. The ancient Odeon with capacity of 300 – 350 seats is one of the most recent archaeological sensations of the city. It served as the seat of the city council of Philipopolis. Both in antiquity and nowadays Odeon is used for chamber, theatrical, musical and literary events.