The ultimate in a rounded building the Walt Disney Concert Hall in downtown Los Angeles. It was actually the first of of Frank Gehry’s designs using exterior curved skins. But because of a shortfall in donations only the underground parking and the concrete base for the concert hall was done for several years. During that time Guggenheim Museum in Bilbao, Spain was completed.
It should also be noted that without computer design software these types of exterior panels could never have been done.