I've always fantasized about this topic and because of the architectural interest, wanted it to be a round barn.
I'm having discussions about a building, but for practical reasons will likely go with a metal building. The contractor is a good friend and he and his wife are into aesthetics so I'm talking to him about ways to minimize the fact that it is a metal building.
Old beautiful things typically require lots of maintenance.........a curse that I like old beautiful things more than anything new..
Clear span is one of the main reasons to go with new. However for inspiration of old with a clear span. Check out the west Baden resort in French Lick Indiana.
https://en.wikipedia.org/wiki/West_Baden_Springs_Hotel