Beinhaus, Medieval ossuary at Bad Doberan monastery, Germany.

The Beinhaus, also called Michaeliskapelle, is an eight-sided brick chapel built around 1250 on the former cemetery north-east of the Bad Doberan church. Its walls are banded with alternating glazed and unglazed brick above a running base moulding, and corner shafts rise into a ring of blind gables. Slender round-arched windows and a blind rosette above the door mark the facade; a tent roof replaced the octagonal lantern in 1984.

The chapel was built around 1250 in early Gothic style on the former cemetery north of the church. It held the bones of deceased monks whose graves were reused. In 1879 Karl Christian Andreae painted the interior murals based on medieval remains. From 2002 to 2010 the altar relief, facade, windows, floor and door were renovated.

The ossuary reflects medieval monastic life and the practical ways communities managed burial space within their religious grounds. Monks stored remains here to make room for new burials, a common practice in medieval monasteries.

The structure stands within the monastery grounds and is accessible from the courtyard area, where visitors can view it up close. The monastery administration can arrange tours that provide access and explain the building's history and purpose.

The octagonal shape was unusual for storage buildings of its time, standing out from standard rectangular structures. This geometric choice suggests the builders considered the design important despite the building's purely practical function.