/ At the top of the hill of the Alfama in Lisbon is the Castle of St. George, which is another outstanding attraction. It's a ruin, but the walls, the entrances, the gates, the staircases are all spectacular and the view is astonishing. It really makes it worth your while to come up and visit the castle. At the top of the hill of the Alfama is the Castle of St. George, which is another outstanding attraction. It's a ruin, the interior does not have too much but the walls, the entrances, the gates, the staircases are all spectacular and the view is astonishing. It really makes it worth your while to come up and visit the castle.