The Adicus Theatre in Greece was built in 161 AD and is the oldest theater in the world and the most outstanding building of the same period. The theatre has 32 rows of seats for up to 6,000 spectators. The semi-circular open-air theatre, 38 metres in diameter, can be clearly seen and heard on stage at any point in the venue. The stage is set in Roman-style window-shaped walls, and the alcove is decorated with statues. There are still performances in the summer theater, and the music festival in Athens from May to August will perform music, dance, drama and other programs. The last picture is the poster we see.