Chartist Cave

Chartist Cave is a culturally significant cave on Mynydd Llangynidr in southern Powys, Wales. The entrance is a broad arch formed of Twrch Sandstone which overlies the Carboniferous Limestone immediately beneath.

The cave is located at about 2.5 kilometres north-northeast of the village of Trefil at an elevation of about 550 metres , at OS grid reference SO 127152 . The entrance to Chartist Cave is high on the moors near the summit of Mynydd Llangynidr. The arched entrance is formed by a Twrch Sandstone cap from beneath which the underlying limestone has been eroded. The cave is also known by two different names in Welsh: Ogof Fawr and earlier as Tylles Fawr . The more commonly used modern name derives from 1839 when Chartist rebels used the cave to stockpile weapons in advance of their march on Newport in November of that year. There is a plaque at the entrance commemorating the Chartists' actions.

Wikipedia