This is part of our weekly series, Lost Masterpieces, about the greatest buildings and works of art that were destroyed or never completed.
By the side of a highway on the outskirts of Rome, a mountain of white steel pops out of the landscape. Curved and climbing to a peak like a rigid circus tent, its gridded, geodesic framing appears from a distance to be some sort of humpback dinosaur's skeleton.
And it is a skeleton, in a way.