agia grigoriou orthodox monastery at mount athos greece

aegean athos background bay chalkidiki coast destination greece greek holy monasteries monastic mount mountain mountainous nature orthodox peninsula range religious sailing scenery sea shore tours travel traveling trip woods water surface forests woody green summer historical christianity europe eastern coastline coastal panorama scenic view secluded solitary country ridge skete old ancient stone history religion christian rocky faith devotion monastery exterior building architecture landmarks agia grigoriou halkidiki macedonia heritage unesco solitude seclusion landmark orthodoxal