The Great Synagogue in Iaşi is an Ashkenazi synagogue built between 1657 and 1682. It was restored in 1977 and 2015. This vernacular brick building still serves as a synagogue.
The Monastery of the Three Hierarchs is an important 17th century monument, whose church was erected between 1637 and 1639 as a royal necropolis. In 1641 the relics of the Three Hierarchs (Basil of Caesarea, Gregory of Nazianzus, John Chrysostom) were placed in the monastery church. Plundered and burned by armies (1650, 1686), shaken by earthquakes (1711, 1781, 1795, 1802), the church was restored between 1882 and 1904.
The Metropolitan Cathedral of Iași is one of the six Orthodox Metropolitan Cathedrals in Romania. It was built from 1833 to 1887 on the site of two old churches: the White Church (15th century) and the Stratenia Church (17th century). The interior painting was carried out by master Gheorghe Tattarescu (1820-1894). In 1889, the relics of Saint Paraskeva of the Balkans, the protector of Moldavia, were placed in the church.