The Alte Synagoge in Erfurt, Germany, was built c. 1100. It is thought to be the oldest synagogue building intact to its roof still standing in Europe. It is used as a museum and permanently houses the Erfurt Treasure, a hoard of coins, goldsmiths' work and jewellery that is thought to have belonged to Jews who hid them at the time of the Black Death pogroms in 1349. The pieces were found in 1998 in the wall of a house in a medieval Jewish neighbourhood in Erfurt.