I thought the Pantheon was built of stone. But you are be right, it's called "Roman concrete": http://en.wikipedia.org/wiki/Roman_concrete http://en.wikipedia.o

I thought the Pantheon was built of stone. But you are be right, it's called "Roman concrete": http://en.wikipedia.org/wiki/Roman_concrete http://en.wikipedia.org/wiki/Roman_concrete About the article and videos, great that some architects value the old buildings. We have already enough of the Modernism/Bauhaus style full-concrete buildings. Tourists usually come to visit Rome, Vienna, Venice, ... because of the beautiful old buildings. They used (rusty) steel/iron-beams to hold together the Colosseum in Rome, the steel looks very out-of-place. The Pantheon is indeed one of most inspiring buildings and one of the oldest that is still almost completely intact.