Its military architecture shows that there was a castle here although there is only a square tower left. Part of it houses a belfry on the top. Between 2002 and 2004, there were three archaeological excavation campaigns in the castle as part of the Aldeias Históricas de Portugal Programme. They discovered hundreds of traces of its medieval occupation, between its construction in the 12th century and when it was abandoned in the 17th century. Portuguese coins from the reigns of King Sancho I (1169-1210) to King João III (1521-1557), iron and copper artefacts, pieces of ceramics among others that can be viewed at the Castelo Novo Museum at the old Town Hall.