[2] It consists of more than forty re-erected buildings from various locations in Wales, and is set in the grounds of St Fagans Castle, a Grade I listed Elizabethan manor house.

[12] In June 2019, St Fagans was named UK's Museum of the Year 2019 by the Art Fund, which commended the facility's "exceptional imagination, innovation and achievement".

[13] The museum comprises more than forty buildings representing the architecture of Wales,[6] including a nonconformist chapel (in this case, Unitarian),[14] a village schoolhouse, a toll road tollbooth (below), a cockpit (below), a pigsty (below), and a tannery (below).

[3] The medieval parish church of Saint Teilo, formerly at Llandeilo Tal-y-bont in west Glamorgan (restored to its pre-Reformation state), was opened in October 2007 by the Archbishop of Canterbury, Rowan Williams, and still serves as a place of worship for Christmas, Easter, and Harvest Thanksgiving.

This festival, which includes a Shakespeare play, a musical, and a children's show, has become part of the Welsh theatrical calendar since its founding at Dyffryn in 1983.

[21][22][23] Based on archaeological findings, a reconstruction of Llys Rhosyr, a thirteenth-century court of the princes of Gwynedd,[24][25] was completed and opened to the public in October 2018.

The new gallery was opened in October 2018, housing improved facilities for visitors while supporting the study of collections and hosting demonstrations and workshops by traditional craftsmen.