The exterior of the Caltech Submilimeter Observatory atop Mauna Kea is chock full of triangles, squares, hexagons, curves, lines, etc. You could check it out, except that it’s invisible! Well, it is now, because it was decommissioned in 2015, and last year was dismantled and removed.
Posted for Becky’s Squares: Geometric. See more responses here.
Graham's Island 
Hmm you might win Mr Geometry with that one!
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I could have done a week’s worth of telescope photos, now that I think about it!
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It certainly has lots of geometry
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Had!
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I meant the photo 😀
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I know!
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Good job you took the photo when you did!
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Just luck. I was up there with my brother last year and they removed the structure soon afterwards.
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oh you had me for a moment on the invisible!
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Perhaps it’s still there and we just can’t see it!
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first the eyes, and now this . . . . .
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I’ll try to behave from here on!
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no keep misbehaving, keeps us all young
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