The plaza’s terrazzo floor is actually a celestial map that marks the time of the dam’s creation based on the 25,772-year axial precession of the earth.
~ Alexander Rose from, https://longnow.org/ideas/02019/01/29/the-26000-year-astronomical-monument-hidden-in-plain-sight/
These weren’t on my mind when we planned our visit, but it was a rare moment of delightful recognition when I spotted them. So often I find interesting places, and then never get there.
And sometimes I go places specifically after finding them on the Internet.
ɕ