The so-called Powder Tower originally served as one of the Riga defensive system buildings. There is no information on the exact date of the construction, but the first tower on this place was built in the 13th century. The name of a tower - Powder, has appeared later. In documents for the first time this place has been mentioned in 14th century by the name of Sand tower. The modern tower has been constructed on a boundary of 15th and 16th centuries. During the centuries it has been collapsed and later restored. The entrance of the tower was at the height of 5 meters, and it was possible to get to a tower only having walked upstairs.
After the Great Northern War the Powder Tower lost its military value. Tower reconstruction was began in the end of 19th century. The new pointed roof has been constructed. Last time the tower has endured reconstruction after the First World War when the Military museum of Latvia has been situated in it.
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.