Hattula Church is one of the oldest brick buildings in Finland. It was built in the 15th century and dedicated to the Holy Cross. Wall paintings are from the 16th century. The porch in front of the hall was built in the 16th century of grey stone and bell tower in 1813.
Unique for having been built almost entirely of brick rather than stone, the church was a popular pilgrimage destination during the Middle Ages. A grey stone perimeter wall was added in the 16th century. The church contains paintings from the years 1510 through 1922, as well as 40 wooden sculptures dating to the first half of the 14th century. Precious-metal crowns which had formerly belonged to the church were confiscated during the Reformation. The church pulpit, dating to 1550, is the oldest surviving pulpit in Finland. A second pulpit was built in the 17th century.
The Hattula church is known for its lime paint frescoes done in late Gothic style, likely completed by the same group of artists who later painted the St. Lars church in Lohja.
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.