euphorbia flowers Greece Greek landscape mountains natural nature olive plants spring spurge trees wild yellow bush Cacti cactus invader naturalised opuntia pear plant Prickly boats buildings busy coastline dock Gytheio harbor harbour holiday leisure mediterranean moored resort sea ships town trawlers vacation water wharf architecture balconies balcony beige city elements home house orange pink shutters urban windows abundance abundant crowd flora many mauve profusion white bay houses island kefalonia Sami summer tourists travel yachts countryside hills homes path rural track trail view village acropolis ancient Athens classical historical landmark old parthenon pillars Remains ruins stones Erectheion