A scheduled monument is a nationally important archaeological site or monument which is given legal protection by being placed on a list (or "schedule") by the Secretary of State for Culture, Media and Sport; English Heritage takes the leading role in identifying such sites.
They range from prehistoric standing stones and burial sites, through Roman remains and medieval structures such as castles and monasteries, to later structures such as industrial sites and buildings constructed for the World Wars or the Cold War.
The oldest site Aveline's Hole, a cave in which bones from the Mesolithic have been identified making it the earliest scientifically dated cemetery in Britain.
[3] More recent sites date from the Industrial Revolution and include the Elms colliery and glassworks in Nailsea.
The most recent monuments are two Palmerstonian gun batteries, built in the 1860s, on the island of Steep Holm.