The Parc Cwm long cairn (), or Parc le Breos burial chamber (), is a partly restored, prehistoric, megalithic chambered long barrow, built between 5,800 BP and 6,000 BP (before present), during the early Neolithic period, about three quarters of a mile (1.1 km) north west of Parkmill [REF].
There are caves further along Parc Cwm valley, Cathole Cave and Llethryd tooth cave, which have been used from Mesolithic to Medieval times.