The Penstrowed Quarry was an important source for local stone and was used for building the Caersws workhouse.

It was later acquired by Montgomeryshire County Council and a railway siding connecting the quarry to Cambrian main line laid in 1902 and closed in May 1937.

[3] Glandulais is a small Late Georgian house of two storeys and four bays—the windows mostly tripartite with cambered heads.

In the drawing room a ceiling with trophy motifs in an oval of leaves, and a frieze of garlands.

It is stone built in the Vernacular style with a gable entry plan and small-pane flat-headed windows.