[ignormies]

The spire in Scottsdale is also a big pointy object that was completed (but long after he died). Looks like it was originally meant to be at the state capital, so perhaps it's the same one you're referring to?

https://maps.app.goo.gl/ftdtd2WhghdcYV9R7

https://www.atlasobscura.com/places/frank-lloyd-wright-spire