Located on Battenberg Square in Sofia, the National Art Gallery occupies the historic Ottoman Chelebi mosque and konak, converted into the former royal palace of Bulgaria. The palace, built in two stages during the late 19th century, served as the residence for Bulgarian royalty. After World War II, the monarchy was abolished, and the palace was largely given to the National Art Gallery.
 Established in 1934, the gallery moved to the palace in 1946. It houses a diverse collection, including Renaissance and contemporary art, medieval paintings, and over four thousand icons. The National Gallery for Foreign Art, an independent section, was established in 1985. Since 2015, the 19th and 20th century collections are exhibited together, creating the National Gallery Square 500.
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.