Buildings have many non-stationary elements. The Lapidarium forms the basis of our architectural collection. This is a collection of architectural elements made from stone. These include grave slabs from churches, such as the tombstone slab of Heinrich von Graslegen, former headmaster of the medieval monastic school at St. Ägidien. The collection also includes fascinating historical models of stage sets, donated to the museum by the Brunswick Theatre in 1942, the year of its 250th anniversary, as well as numerous architectural models made of cork and wood from between 1900 and 1950.