Note the deep grooves in the columns of the 2,100 year old ancient Roman Temple of Antoninus and Faustina ago. They were probably for spolia - the ancient practice of reusing cut stone from existing structures. I don't know if the grooves were cut prior to construction, or added afterwards in an attempt to dismantle the structure.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...s_fullsize.jpg
More: https://en.wikipedia.org/wiki/Temple...s_and_Faustina
Previously:
Moving marble - GIF
Marble gang saw GIF
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