The Tour Obidos is great for those interested in seeing a very old fortified city. For its excellent location by the sea and as the arms of the lagoon reached the hill, hese lands since there were always inhabited, as confirmed by the Lower Paleolithic season Outeiro of builds. Here it formed a Celtiberian castro, facing west.

It is known that the Phoenicians traded here, and today more properly the Romans settled here and it is likely that the south tower of the Torch, has had its origin in a watchtower tower of Roman construction, such as advanced post of the city of Eburobrittium , large urban metropolis found and archaeological work phase.

On 11 January 1148, the first king, Afonso Henriques, supported by Gonçalo Mendes da Maia, Obidos took to the Arabs, after the siege of the previous November. The Cruise of Memory is a simple monument of the time, later restored. Obidos belonged to the defensive pentagon (the five castles), the center of the kingdom, created by the Templars.