Interesting Cathedral Documentary and various links

I turned on PBS and caught the end of a documentary Building the Great Cathedrals. When I checked last you can watch it for free on the PBS ap.

They have a great interactive - Physics of Stone Arches where you can test how tall you can build rounded and pointed arches.

They have a presentation - Medieval Stained Glass Science which walks you through the process of making stained glass.

Also of interest-

Article of the Parthenon

Roman Mosaic Interactive