17th century access arch architecture Argolis castle defence defense elements entrance fort fortress Greece historical landmark Morea nafplio old Palamidi Peloponnese power stairs steps stone stronghold venetian ancient battlements Bodiam Castle England english Great Britain high kent masonry moat national trust reflection security strong tower wall water building city defend defensive fortification Israel Jerusalem limestone modern New promenade road secure strength trees walkway hilltop ramparts view walls alcoves interior levels Remains beach beam breakwater cloud coast gravel groyne horizon ocean sea seaside shingle shore sky structure Sussex tide wave wood wooden barrel cannon Cornish cornwall firarm guard guarded gun harbour metal natural nature port stock bell