A lot of things are unique about Arizona. One of them is our architecture, from the beautiful buildings to the overpasses on the highway that include decorations you just don't see in other states.

People from all over the world come here to be inspired by Arizona and incorporate it into their designs.

And about an hour north of Phoenix is another remarkable feat of architecture. It's off the beaten path, and the signs are easy to miss. And the buildings were designed with the environment in mind, so they blend in perfectly.

This is the artist collective known as Arcosanti. It was the brainchild of Italian-born architect Paolo Soleri in 1970.

Today, the Valley 101 podcast will give you an audio tour. Along the way, we'll answer three key questions:

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