Triumphal arch with sea-view

On the south-eastern slope of the Cabeço Gordo, in Arrimal, 2480 Porto de Mós (39° 30' 6.08" N  8° 53' 45.32" W) stands an impressive triumphal arch.

According to the inscription it was built by king Alfonso Henriques, swearing that all land, seen from that point towards the sea, would be donated to the monks that would build the monastry of Alcobaça.

Indeed from the Arco da Memoria you have a great view of the coast.