There are many ancient ruins all round the world which have similar building oddities, from small blocks to huge mega ton blocks.
One of these oddities is called protuberances, also called nubs, nodules and other names to describe a protruding piece of the stone block.
Some think they have been used as an anchor point when lifting the stone but some stones where these are found do not fit that explanation.
As mentioned these ancient sites are found across many continents around the world and were built 1,000’s of years BC, and before the great oceans were supposedly navigable! Global cooperation, skill sharing and trade has been happening for many thousands of years before academia thinks i did!
Sites around the world that have this stone oddities are found in The Pyramids in Giza, Peru, Japan, Russia, India, China, Stone-henge in England and more.