wizarding schools around the world: Hogwarts School of Witchcraft and Wizardry #2: "The castle is located in the mountains near a loch. The precise location of the school could never be uncovered because it was rendered Unplottable. To Muggles the school looks like an old abandoned castle. "
"This may be a 17th C charmstone of the kind represented in the collections of the NMS, where round crystals are found set in silver on a chain for dipping into liquids as charms against disease, see Hugh Cheape, Charms against witchcraft in Goodare and Martin and Miller, Witchcraft and belief in early modern Scotland . Meaney suggests these balls were frequently complemented with a sieve-spoon and were mostly found in female burials. Source: British Museum"