The Faith Museum in Bishop Auckland is a small building for a client with outsize ambitions. Built to tell the tumultuous story of spiritual life in Britain over 6,000 years, it is the brainchild of philanthropist Jonathan Ruffer, whose mission is to rejuvenate this small postindustrial town in the north of England through tourism. A constellation of new cultural attractions is arrayed around the magnificent Auckland Castle, the hilltop home of the Bishop of Durham for 850 years, until Ruffer bought it and admitted the public. Níall McLaughlin Architects was appointed to design two additions—a timber viewing platform standing like a medieval siege engine at the entrance gate (2017), and the nearly 11,000-square-foot museum, a modest yet somehow monumental stone wing extending from the castle itself.