Papercraft Models
Models that are flattened for you to print, cut out, fold and stick together to make simple paper 3D models.
Bryn Celli Ddu:
Llanfechell:
3D PDFs
PDFs that contain annotated versions of the 3D models. You can use the menu bar on the left, or the drop down menu at the top of the page to view information, as well as using the 3D toolbar to explore the model. You can read more about 3D PDFs on the Adobe website.