Stock photography, photos: Pera castle Stock photos of The ruins of Pera castle above the town of Horio, Kalymnos, Greece Photograph: © Alistair Baird Click for a larger image and more information Keywords associated with this stock photo: pera, castle. horio, ruins, pothia, kalymnos, dodecanese, greece,greek, stronghold, fort, defend, ancient, blue, whitewash, mediterranean, st. john, historical