Surveys of the condition of the scheduled monuments in Wales have been taking place since the mid-1980s and are carried out in-house by Cadw’s team of Field Monument Wardens.
Mae arolygon yn cael eu cynnal ar gyflwr henebion cofrestredig yng Nghymru ers canol y 1980au ac fe’u cynhelir yn fewnol gan dîm Cadw o Wardeniaid Henebion Maes.