In general, if the object of a motional preposition is a place which people and/or animals normally go inside of, the proposition meaning 'to' will be в+Acc, the preposition meaning 'at' will be в+Prep, and the preposition meaning 'from' will be из+Gen. The following nouns, however, require на+Acc or +Prep for the meanings 'to' and 'at' and с+Gen for the meaning 'from'.