St Fagans National Museum of History opened to the public in 1948 as the Welsh Folk Museum. Its creation followed the donation of St Fagans Castle and its grounds to the people of Wales by the Earl of Plymouth. The late sixteenth-century manor house, gardens, woodland, and farmland offered space for an open-air museum inspired by Scandinavian precedents. Iorwerth C. Peate, the museum’s first curator, argued that buildings, objects, language, and craft should be preserved together so visitors could encounter the material conditions of Welsh life.

The museum collected threatened buildings from across Wales, carefully dismantling and re-erecting them at St Fagans. Farmhouses, cottages, a school, chapels, workshops, a tollhouse, shops, and industrial community buildings created a landscape of different regions and periods. Interiors were furnished to particular dates using documentary and oral research. The method saved structures that might otherwise have disappeared, but it also required curators to make choices about location, appearance, and whose lives were represented. Each reconstructed building became both historical evidence and a modern act of interpretation.

Working demonstrations made the site more than an architectural collection. Blacksmithing, milling, weaving, clog making, baking, farming, and seasonal customs showed how tools and buildings functioned in practice. Welsh-speaking staff, recorded testimony, photographs, and everyday objects helped connect physical settings with family and community experience. The museum continued to add buildings associated with rural life, religion, education, commerce, labor, and leisure. Notable additions include St Teilo’s Church, reconstructed with a vividly painted medieval interior, and the Oakdale Workmen’s Institute from the South Wales coalfield.

Over time the museum broadened its name and interpretation. It became the Museum of Welsh Life and later St Fagans National Museum of History, signaling attention to national history as well as traditional folk culture. New collecting addressed migration, urban life, industry, popular culture, and the recent past. A major redevelopment completed in the 2010s created new galleries, learning spaces, and Gweithdy, a center for craft. Community participation increasingly influenced exhibitions and collecting, allowing people to contribute objects, memories, skills, and competing views of Welsh identity.

Today more than forty historic buildings stand within the estate, surrounded by gardens, fields, and woodland. St Fagans Castle remains an important part of the visit, but the transferred structures form the museum’s central historical argument: everyday places can reveal social change as powerfully as monuments. The site preserves evidence of work, worship, home life, education, and recreation while acknowledging that Wales has never been culturally uniform. Its growth since 1948 records changing ideas about museums themselves, from rescuing rural traditions to interpreting an industrial, urban, multilingual, and diverse nation.