I though that we had the only I-Beam Orion. While watching the Daily Show, I noticed that there was a sculpture in New York City that looked a lot like the I-Beam Orion:
Is this like the Cube? I know that the twin of the one at the University of Michigan is located in Astor Place (although it is less well-maintained).
UPDATE: Apparently, there's another I-beam Orion in Chicago, too.