Photo ©Paul R. Davis

The earthworks in Brogyntyn Park, part of Brogyntyn Hall, are in good condition and consist of a well defined outer ditch 20 feet wide and 6 feet deep which forms a circular enclosure with a diameter of 250 feet. The interior of the ringwork has been levelled and in the past it was used as a bowling green. Most unusually there is a rock cut tunnel which has been cut diagonally north west to south east through the natural rock beneath the ringwork. The tunnel entrances lie in the ringwork ditch and about 150 feet long, 6 feet high and 5 feet wide. It curves slightly towards its centre so that it is not possible to see directly from one end to the other but it is possible to walk its full length. It is not of medieval origin, so it may be connected to its later role as a landscape feature.