There are now over 30,000 listed historic buildings, over 4,200 protected historic monuments, nearly 400 registered historic parks and gardens, and four World Heritage sites.
Erbyn hyn, mae dros 30,000 o adeiladau hanesyddol rhestredig, dros 4,200 o henebion hanesyddol gwarchodedig, bron i 400 o barciau a gerddi hanesyddol cofrestredig a phedwar safle Treftadaeth y Byd.