Vaxholm Castle was originally constructed by Gustav Vasa in 1544 to defend Stockholm against shipborne attacks from the east, but most of the current structure dates from 1833-1863. The stretch of water below the building was formerly the main sea route to Stockholm. Thus, the fortress was strategically situated to defend the city from naval attacks. The castle was attacked by the Danes in 1612 and the Russian navy in 1719. Since the mid 19th century, its military importance has ceased. Today, it is home to the Swedish National Museum of Coastal Defence.
In 1970, it was used as a movie location for the pirate stronghold in Pippi Longstocking in Taka Tuka land. A scenic view of the castle may be seen from the car ferry which plies the short distance between Vaxholm and Rindö.
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.