The Castle of Nice was a citadel used for military purposes. Built at the top of a hill, it stood overlooking the bay of Nice from the 11th century to the 18th century. It was besieged several times, especially in 1543 and in 1691, before it was taken by French troops in 1705 and finally destroyed in 1706 by command of Louis XIV.
Nowadays, Castle Hill is used as a park. It's the most famous public garden in Nice, and a 'must see' place for the numerous tourists who visit the city. It offers many amazing panoramas, and provides a beautiful view all day long from sunrise to sundown, highlighting various landscapes depending on where one looks: the Harbor at sunrise, the Promenade des Anglais at sundown. That's why Castle Hill is called 'the cradle of the sun'.
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.