"The sinkhole, located in the Piazza della Rotonda, is almost 10 square feet (1 square meter) wide and just over 8 feet (2.5 m) deep. Inside the hole, archaeologists found seven ancient slabs made of travertine, a type of sedimentary rock."
more at https://www.livescience.com/sinkhole-pantheon-rome-ancient-paving-stones.html
Images https://imgur.com/a/SeFbx2r
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