ebro river and 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 hilltop scenery castell mequinensa touristic europe european iberian peninsula battlement slope wood forest nestled region spain perched overlooking tranquil impressive stunning views landscape rich water bridge