byzantine heptapyrgion fortress ruins thessaloniki greece

heptapyrgion yedikule fortress thessaloniki greece byzantine ottoman architecture history heritage landmark ruins ancient travel tourism cultural castle stonework historicsite greek mediterranean oldtown monument historic travelphotography wanderlust explore landscape archaeology greekculture ancientarchitecture travelgreece cityscape historiclandmark heritagesite discovergreece scenic culturalheritage greekhistory adventure landscapes historylovers visitgreece architecturephotography byzantium ancientsite fortification historicbuilding travelphoto historicmonument