Legend says...

Proença-a-Nova, one of the twelve villages of the Grão-Priorado do Crato, a very old village located between the Alvito and Isna streams, in the district of Castelo Branco, was initially called Cortiçada and later Vila Melhorada. It was given a charter by D. Manuel I. Regarding the name of Cortiçada, legend has it that it was formed or came from the fact that its inhabitants, seeing the moon shining in the sky, wanted to possess it. For that, they put tenements on tenements and, on the improvised tower, a man. As he said, at one point, that there was only one tenement to left to reach the moon, someone suggested that, if there were no more tenements, the one at the bottom should be removed and moved up.

With the displacement, the inevitable happened: the collapse. The assistants exclaimed:
"There goes the cork!" ..."