The open-air St. Fagans: National History Museum, near Cardiff, first opened its doors to the public in 1948. It has earned an international reputation for rescuing threatened historical buildings, which it carefully dismantles and moves to its grounds. There the structures are rebuilt and painstakingly refurbished to their past appearance. To date, the Museum has moved and saved more than forty buildings, ranging in date and type from medieval timber-framed farmhouses to a late-1940s aluminium prefabricated bungalow. One of its most prized pieces, however, is the small medieval church of St. Teilo's from South Wales.

Although the building ...