This is a called Serpents Lair of Inis Mór, located in the Ireland, UK.
We were told this granite has naturally been formed hundreds of thousands of years ago, which is hard to believe that a nature would cut out a PERFECT rectangle out of a granite stone.
Judging by the look of this, I can tell that the ancient builders have created this rectangle hole which works like a sink, so that when the tide comes in from the sea, the water goes into this hole, and via underground tunnel and goes back into the ground.
Not only did the ancient builders create everything with a purpose in mind, they also unquestioningly had electric power tools in order to do so.
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