Phrourion is a Greek fortress dating back to the 6th century BC. which had the function of controlling the entire surrounding valley.
The church of San Giacomo, which is also in ruins, was built in the 18th century from the remains of the fortress.
I recommend everyone to see the video of the historian Gaspare Mannoia on Phrourion
From the top of the hill you can enjoy a SPECTACULAR panorama