Matthew Chapel (Matthiaskapelle) is one of the most important chapels in Rhineland-Palatinate. This chapel was built as a reliquary chapel for the safe keeping of Apostle Matthew’s head. Heinrich II of Kobern brought this relic from the Damiette crusade (1217-1221). The head was kept there for 150 years. Between 1362 and 1381, it was at castle Helffenstein. From 1422 till 1927 it was kept in the cathedral treasures of Trier. After that it was given by Nuntius Pacelli, later Pope Pius XII, to the St. Matthew abbey of Trier. The unusual ground-plan of the chapel is hexagonal and refers to oriental influences of the construction. It was built around 1220-1230.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.