馆 (guǎn) is a bound morpheme (cannot stand alone as a word) that attaches to the end of a noun to denote a type of establishment. Its main senses cover: diplomatic missions (大使馆 'embassy', 领事馆 'consulate'); cultural venues (博物馆 'museum', 图书馆 'library', 美术馆 'art gallery'); and commercial or service venues (餐馆 'restaurant', 咖啡馆 'café', 旅馆 'hotel'). In older usage it could refer to a private school (学馆). Understanding this morpheme helps decode many common location nouns.