Some years ago, a Celtic settlement was found near Frankfurt together with important princes’ graves from the 5th century BC and a place of worship. The new Celtic museum now forms the focus of an archaeological park and research centre. The hybrid structure consists of two parts: a reinforced concrete core, which acts as an anchor for the cantilevered steel exhibition volume that projects from the slope. Two full-height longitudinal trusses linked by a Vierendeel girder distribute the weight of the cantilevered section. Celtic history is disclosed in layers: black meandering strips are transformed into showcases, tables and seating; and behind a panorama window, the burial mound becomes an exhibit.