A medieval church, perhaps the chapel referred to in the name Eglwysegl, was marked on Speed and Saxton's 17th-century maps of the valley, but it had disappeared by 1808. The school church of St Mary's, built on land donated by Sir Watkin Williams-Wynn, was opened in 1871; it held its last service in 1985 and has now been converted to residential use. The valley also contained a nonconformist (Calvinistic Methodist) chapel, built in 1856, closed in 1930, and now ruinous. Until the early 20th century, when they were culverted, there were many fords across Eglwyseg's numerous streams (the road from Esclusham Mountain still fords the river at World's End), and there are also a number of 18th-century stone bridges.