The construction Haga Church (Hagakyrkan) began in 1856 and it was finished in 1859. The church and the pulpit were designed by architect Adolf W. Edelsvärd. The church represents the Gothic revival architecture style.
The first organ was installed in 1861 by the Danish firm Marcussen & Søn for the price of 20 000 Swedish crowns. It was rebuilt in 1911 (pneumatic action) and 1945-1951 (electric action) by the Magnusson organ building firm. It was restored to close to original condition 2002-2004 by Åkerman & Lund.
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The Erfurt Synagogue was built c. 1094. It is thought to be the oldest synagogue building still standing in Europe. Thanks to the extensive preservation of the original structure, it has a special place in the history of art and architecture and is among the most impressive and highly rated architectural monuments in Erfurt and Thuringia. The synagogue was constructed during the Middle Ages on the via regia, one of the major European trade routes, at the heart of the historical old quarter very close to the Merchants Bridge and the town hall. Many parts of the structure still remain today, including all four thick outer walls, the Romanesque gemel window, the Gothic rose window and the entrance to the synagogue room.
After extensive restoration, the building was reopened in 2009. On display in the exhibition rooms is an collection of medieval treasures discovered during archaeological excavations. This includes 3,140 silver coins, 14 silver ingots, approx. 6,000 works of goldsmithery from the 13th and 14th centuries and an intricately worked wedding ring of the period, of which only two others are known to exist anywhere in the world. A mikveh (Jewish bath) has been excavated close by (13th/14th century). The Old Synagogue, the Small Synagogue and two Jewish cemeteries together form a network of historical buildings and sites which vividly portray the role of Jewish life in the history of Erfurt.