title: Three Brothers, Riga
context: The Three Brothers (Latvian: Trīs brāļi) is a building complex consisting of three houses, situated in Riga, Latvia. The houses together form the oldest complex of dwelling houses in Riga. The houses are situated at the addresses 17, 19 and 21 Maza Pils Street (Latvian: Mazā Pils iela), and each represents various periods of development of dwelling house construction.[1]
question: What is the oldest structure in Latvia?
answers: Three Brothers