In the mid 19th century it was the busiest resort of the Syrians. Its old mansions with the large gardens are grandiose and resemble those of Kifissia. The ones that stand out are of the families Psiaki, Valmas with its red tower, Tsiropina that operates as a cultural multi-purpose venue, Ladopoulos, Foustanos, the tower house of Georgiadis, Aragis, etc. The color of the facades gives a joyful appearance in Della Grazia -in fact, the church of Agios Ioannis Prodromos as well, which was built in 1876 and has an outer bell tower, is painted in light blue. It is believed that there was a settlement called Posidonia in the antiquity. Tombs, tomb offerings, and marble slabs were found in the wider area of Chalepa, the hill where the Catholic church of Agios Petros rises which is said to have been built in 1871 on the ruins of a temple dedicated to Poseidon. In the early 19th century Posidonia was renamed into Della Grazia, after the church of Panagia tis Haritos (Madonna della Grazia) in the north of the settlement. The country church that existed in 1631 was Catholic. After 1823, when the pirate raids ceased, Della Grazia started being inhabited permanently.