Despite being in ruins, St Andrews Castle is worth visiting to learn about its 450 year history. The Visitor Centre provides several exhibits and a multi-media presentation. A sense of its former magnificence is enjoyed from the courtyard. You can explore the tunnels, called a mine and countermine, that were dug into rock during the battle between Scottish Protestants and the English Catholics in the mid-16th century. Plus gawk into the bottle dungeon, the remains of the grizzly prison.