Parga's Castle was built by Normans in 14th century. Also around Parga still exist number of Castles you can visit.

Paramythia Castle
Castle St. Donatos or Paramythia's castle built by Justinian in the 6th century
Eleytherohori  Castle
The castle was built in Eleftherohori by Ali Pasha to control the passage of the
Souli Castle
The castle was built by Ali Pasha after his victory against the heroic fighters
French Fortress

French Fortress in Island of Parga