St Michael and All Angels stands outside the village of Castlemartin, adjacent to two holy wells which may indicate the site held religious significance in pre-historic times. A cross, dating from the 7th–9th centuries, was discovered embedded in the church wall in 1922, but has subsequently been lost. The main body of the current building dates from the 13th century, although the centrally-placed tower is later, of the 14th or 15th centuries. The church was restored, firstly in the early 19th century, and again in 1858.
The church has some notable Victorian stained glass from the studios of Hardman & Co. and Heaton, Butler and Bayne. A Hardman window of the Crucifixion, to a design by Augustus Pugin, has been described as the best example of Pugin's work of any church in Wales. The church contains a First World War memorial commemorating three men from Castlemartin who were killed in the conflict. The church was declared redundant in the early 21st century and is now in the care of the Friends of Friendless Churches.
St Michael's is a Grade I listed building. The adjacent vicarage, now derelict, and a mounting block in the churchyard have their own listings.
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The stone church of Gamla Uppsala, built over the pagan temple, dates from the early 12th century. Due to fire and renovations, the present church is only a remnant of the original cathedral.
Before the arrival of Christianity in Sweden, Gamla Uppsala was the seat of Swedish kings and a ceremonial site known all over northern Europe. The settlement was home to royal palaces, a royal burial ground, and a great pagan temple. The Uppsala temple, which was described in detail by Adam of Bremen in the 1070s, housed wooden statues of the Norse gods Odin, Thor and Freyr. A golden chain hung across its gables and the inside was richly decorated with gold. The temple had priests, who sacrificed to the gods according to the needs of the people.
The first Christian cathedral was probably built in the 11th century, but finished in the 12th century. The stone building may have been preceded by a wooden church and probably by the large pagan temple.