The natives in NM told me that when the bomb went off at the Trinity site it was visible 90 miles away.
The sand beneath the device fused with the copper in the containment vessel and made a green sheet of glass at ground zero. The glass was removed because of the extremely high radioactivity.
The site is open for visiting 1 weekend per year, but is not much to see. A minor depression in the ground is about all that is left.
White Sands Missle range is a very interesting site. Had many friends who worked there.
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* The glass was removed because of the extremely high radioactivity. *
Tritonite. It was illegal to collect near Ground Zero and we were being watched. Yet, once we left Stallion Gate, signs pointed where we could by it down the road.