For the 100th anniversary in 1954, Sylvania set this picture up with thousands of flash bulbs.
https://www.trainorders.com/discussion/read.php?2%2C698857%2Cnodelay=1
Apparently the fireworks were added in post.
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For anyone as confused as me: https://en.m.wikipedia.org/wiki/Horseshoe_Curve_(Pennsylvania)
You can see the original photo: open here, then search for horseshoe.
Is it just me or does it look like a Minecraft build?
I would hope those fireworks were added in post considering where they are.