We hadn't realised until buying a ticket that this is now an art gallery, within an old castle. We were warned before handing over our money, so I suspect this happens a lot!
It's beautifully finished inside, and a refreshing change from the rest of the architecture of Las Palmas. The gallery is dedicated to the works of the local sculptor Martín Chirino, who works predominantly in iron
I still have no idea about the castle's history