The Old New Synagogue (Czech: Staronová synagoga; German: Altneu-Synagoge) situated in Josefov, Prague, is Europe's oldest active synagogue. It is also the oldest surviving medieval synagogue of twin nave design.
Completed in 1270 in gothic style, it was one of Prague's first gothic buildings. A still older Prague synagogue, known as the Old Synagogue, was demolished in 1867 and replaced by the Spanish Synagogue.
Read more about Old New Synagogue: Etymology, Interior, Golem of Prague