The Popper Synagogue, also known as the Small Synagogue, is located in Krakow's Kazimierz district at 16 Szeroka Street. It was founded in 1620 by a wealthy Jewish merchant, Wolf Bocian. Architecturally, it is a single-space structure built of brick and stone, supported by massive buttresses, with no distinct stylistic features. The interior of the synagogue features a rectangular main prayer hall with a barrel vault. In 1935, Leon Schönker created polychrome decorations, and the only surviving original furnishing is the 17th-century Baroque doors of the aron ha-kodesh, which depict symbols of strength. The history of the synagogue is a record of ups and downs; after World War II, due to destruction, its sacred character faded, and for years it was used for various purposes, including as a cultural center for the deaf and mute. Ultimately, the Jewish community lost the building in 1965. After several renovations and adaptations, in 2017 the synagogue was purchased and now houses a branch of the Austeria bookstore, restoring a certain form of cultural life to it. As part of the Jewish Culture Festival, artistic workshops are held there, allowing for the exploration of the history and culture of Kazimierz. The architecture and history of the synagogue are a testament to the rich Jewish heritage in Krakow, which has survived despite many difficulties.