A large telecommunications tower is located at the top of the hill, near to which is a heavily vandalised former military bunker.
Wenallt Camp is the remains of an Iron Age enclosure on the southern slopes of the hill.
Together with the Garth Mountain a mile or so to the west, Wenallt Hill can be seen from most of Cardiff city centre.
On a clear day they can be seen from Weston-super-Mare in England, 18 miles (29 km) away on the other side of over the Bristol Channel.
Coed y Wenallt is a 44 ha (0.17 sq mi) area of ancient woodland on the western side of the hill.