Sanctuary de Sant Salvador, an old hermitage, 509m above sea level at the highest point of the Serra de Llevant was the senior house of Mallorca's monastic order and the last to lose its monks in 1992.
The walls were built in the 14th century to protect the town from pirates or invaders. There are walkways and a simple cafeteria along the walls, and a neoclassical church, which was built in 1832.
It is still a popular place of pilgrimage, flanked by two enormous landmarks - to one side a 14m stone cross, to the other a 35m column topped by a statue of Christ holding out his right hand in blessing. The views from the terrace take in Cabrera, Cap de Formentor and several other hilltop sanctuaries dotted across the plain. From the statue of Christ you look out towards the Castell de Santueri, a 14th century rock castle built into the cliffs on the site of a ruined Arab fortress.
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.