Aptera Castle, Crete. The archaeological site of Aptera, which was the most powerful city of western Crete during Minoan times, is located 15 kms from the city of Chania, Crete, just south of Souda Bay, on a hill above the national road which connects Chania and the city of Rethymnon. - See more at: http://www.chania-crete-greece.com/aptera-chania-crete. by nicnac1000, via Flickr
The Venetians built the small fortress Bourtzi, located in the Argolic gulf and close to Nafplio, in 1471. Bourtzi was originally part of the city's defenses, and thick chains ran from the castle to the mainland to prevent enemy ships from docking. Between 1865 and 1935 Bourtzi were the executioner’s residence. Bourtzi, Nafplio, Greece. Sunset by june_godiva, via Flickr
The Grand Masters Palace was built below the Acropolis of Ancient Rhodes where originally the Temple of the Sun God stood. In the same place, in the 7th century, there was also a Byzantine Palace, and then in the 14th century the Knights of St John built the palace as the residence of the Grand Master as an administrative center. It was destroyed in 1856 by a large explosion of gunpowder that was hidden in the basement of the of St John Church.