A visit to Castelo de Almourol.  Perched on an island in the Zezere River, you have to take um pequeno barco to get here.  This fortress was once controlled by the Knights Templar, but before that, the Romans, then the Visigoths and then the Moors.  Many dwellings here, especially the strategically placed ones, have had multiple owners and the title transfers have been ...uhhh...lively... LOL!