If you're ever at the US Naval Academy you can walk by Michelson Hall (the science building) outside of it you will see some small metal disks in the walkway. This are placed in their original locations on the old sea wall (since land filled) where Michelson conducted his experiment to accurately measure the speed of light.

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https://www.usna.edu/NewsCenter/2019/10/Michelson_and_the_Speed_of_Light.php