Like the Pantheon[1]? It's still got the world's largest unreinforced concrete dome and it's in active use as a church not to mention major tourist attraction.

Like the Pantheon[1]? It's still got the world's largest unreinforced concrete dome and it's in active use as a church not to mention major tourist attraction. [1] https://en.wikipedia.org/wiki/Pantheon,_Rome https://en.wikipedia.org/wiki/Pantheon,_Rome