The Kupa ("Cashbox") Synagogue was built in 1643 with funds contributed by the goldsmiths of Kazimierz. [See: Izabella Rejduch-Samkowa and Jan Samek, eds., Katalog Zabytków Sztuki w Polsce, vol. 4: Miasto Kraków, part 6: Kazimierz i Stradom; Judaica: Bóżnice, budowle publiczne i cmentarze (Warsaw: Instytut Sztuki Polskiej Akademii Nauk, 1995), pp. 18-20.]
Initially, the city walls completely hid this synagogue from outside view due to its low position (the current floor is about 80 cm higher than the original).
Renovations and additions introduced many changes to the building over the centuries. A two-story annex, containing a vestibule and washrooms, was added some time between 1830 and 1834. The western wing of the synagogue was built in 1861. At the end of the 19th century the edifice was joined to an adjacent structure. After being ravaged during World War II, the synagogue had to be meticulously restored.
The northern wall of the synagogue connects with remnants of the medieval city wall of Kazimierz, while its south side faces Warszauera Street. The colorful interior of the Kupa Synagogue serves as an exhibition hall and venue for musical events.
For the synagogue interior see:
Rodov, Ilia. The Torah Ark in Renaissance Poland: A Jewish Revival of Classical Antiquity (Leiden and Boston: Brill, 2013)