castillo de san cristobal fort arches

ancient arch arches architectural architecture archway archways blue building buildings castillo cloud clouds column columns courtyard cristobal culture decoration decorative door doors entrance exterior famous fort fortification fortified fortress gray heritage historic historical history juan landmark landscape line lines located monument old one outdoor over pattern patterns perspective pillar pillars puerto rico roof san shadow sightseeing sky spanish stone stones stronghold strongholds structure structures stucco tan the tourism tourist travel traveling wall walls white window windows within world