Walter De Maria
The Lightning Field
http://www.lightningfield.org/
The Roden Crater is also an attractive spot for lightening, and where you can see the rare green flash around the sun at sunrise or sunset.
Have you visited the Lightening Field? I thought de Maria's Broken Kilometer to be a bit dull when I saw it, although the Earth Room smelt kinda cool and the height of the dirt made the room seem so low.