castell de mequinensa, a historic fortress in spain

fortress historic aragon spain hill ebro river medieval castle stone architecture panoramic landscape moorish testament captivating travel destination heritage landmark scenic ancient walls arid cultural tourism exploration ruins citadel preservation historical picturesque viewpoint aragonese history countryside spanish stronghold elevated vantage culture valley centuries-old hilltop scenery castell mequinensa spanish stronghold touristic europe european iberian peninsula walls battlement heritage aragonese hilltop slope wood forest