Cupstone sites in Northern Italy, Switzerland and the Atlantic regions, also known as "druid altars" or "Opferkessel" (sacrificial bowl), are associated with places of worship due their locality close to glacial erratics, view points and treacherous alpine trails. Some of the prehistoric cupstone sites north of the Alps along the Jura mountains, for example near Grenchen, show a row of cups with possibly astronomical orientation. However, cupstones are usually not associated with calendar functions as this is sometimes the case with menhirs and megaliths.