From Hay we climb to atmospheric Mouse Castle Wood, home to ancient oaks and site of an unfinished motte-and-bailey earthwork, consisting of a rock boss with an artificially scarped vertical side. The castle was held by the de Clanowe family in the 14th century. We continue across undulating fields, returning to Hay along the Wye Valley Walk. Distance 8 miles. Ascent 250 metres.

Strong boots and all weather clothing recommended. Bring a packed lunch.