Acrocorinth historic castle on top of the mountain with Euphorbia characias (Mediterranean spurge) yellow flowers, Greece

acrocorinth castle mountain euphorbia characias mediterranean spurge flowers greece historic site landscape blooming nature heritage fortress architecture travel outdoors tourism stone walls scenic ancient ruins greenery sunlight horizon flora wildlife historical hiking culture view peaceful elevation exploration beauty colorful panoramic summer sky tranquility hillside rustic city marvel wanderlust adventure picturesque