On the hill of Paralio Astros it is located the medieval castle. It was improved and remodeled by William Villehardouin in 1256 AC to submit the Tsakones (rebellious and unruly residents of the whole area).
The castle was called Castello della Estella, because of the star shaped peninsula hill.
On the hill there are remains of a wall from the ancient classical times and the castle had visual contact with the Acropol of Mycenae and two other castles of the area.
At the beginning of the Greek revolution in 1821, Zafiropoulos brothers came to the castle to fight against the Turks. They fortified the castle and made three towers for their residence. On 5th-6th of August, 1200 armed soldiers in the castle won the army of Ibraem, about 8000, and forced them to retreat.
The castle, according to Theodoros Kolokotronis (the most important General in Greek revolution), was the only one which was not conquered by the Turks in Peloponese.
The castle got abandoned at the beginning of the 19th century. Two of the towers are half-destroyed and the third is almost ruined.
The visitors can see the wall with loopholes, warehouses, two exterior gates and other ruins. The visitors can also enjoy the marvellous view.