WOW !!! worth watching .

No drawn plans, just models, most of which have been lost or destroyed. What appears to be an international workforce of all different, and sometimes no, religious affiliation, and they've managed to maintain Gaudi's vision through more than a century of changing techniques.

What I find appalling is the construction of a high speed train tunnel under this magnificent structure.

I was especially moved by an interview with one of the stone carvers, a Japanese fellow, describing his "conversation with the stone" and his conversion to Catholicism from Shinto, just to understand better what he was doing.
The train tunnel horrified me.

walked inside and it took my breath away

The History of Alexandria looks interesting too.