These include the oldest rock painting in Britain and the earliest known burial in Western Europe.
64 pre-historic sites are from Paleolithic to Iron Age dates, and include caves, burial mounds and tombs, cairns, defensive enclosures, hillforts and promentary forts.
The 26 post-medieval monuments are more diverse, including industrial and maritime sites, but also leats, quarries, a mill and even an observatory and an orchid house.
The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the National Assembly of Wales.
[1] The list of scheduled monuments below is supplied by Cadw[2] with additional material from RCAHMW and Glamorgan-Gwent Archaeological Trust.