[3][4] Several settlements and hill forts were built on the natural "islands" of slightly raised land, including Brent Knoll and Glastonbury.
[5][6] In the Roman period sea salt was extracted and a string of settlements were set up along the Polden Hills.
[7] 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.
Industrial development, particularly in Bridgwater, are represented by brick and tile kilns and a telescopic railway bridge.
[12][13] The most recent monuments are World War II bunkers and bombing decoys on Black Down.