stone wall and square tower from castle over rocky hill

europe portugal beiras estrela linhares da beira vacation travel tourist gothic medieval romanesque landscape charming sunny hill top slope stone wall old rustic romantic castle chateau stronghold bastion fortress tranquility tower rook landmark historical architecture keep rocky squared merlon fortification deserted facade ancient outer rampart masonry curtain watchtower entrance doorway brickwork brick square over gateway day hamlet unique architectural diversity fruit several times eastern