Look out for: Carn Menyn source of spotted dolerite/bluestones, Bedd Arthur Burial Chamber

The crag of Carn Menyn is the source of the Stonehenge pillars and nearby Bedd Arthur is the Preseli's own, rather unusual, eye-shaped stone circle. There's a memorial to Welsh language poet Waldo Williams at Mynachlogddu. If you're lucky to get clear weather, you'll be able to see north to the Lleyn peninsula and west to the hills of Co. Wicklow in Ireland. Keep your eyes peeled on the hill though as the bird life, particularly in the winter months, can be remarkable with living clouds of starlings congregating to roost there. Also look out for hunting buzzards and sparrowhawks. In the spring ring ouzel and snow bunting are common migrants.

Much of the upland is boggy and, as a result, very acidic so you can find rare acid tolerant plants like fir clubmoss, liverwort, ferns and orchids with insects like the marsh fritillary butterfly and the southern damselfly. Heather carpets the drier heathland in late summer look out for buzzards, kestrels, curlews, ravens and skylarks.