And yet another monolith has appeared again, what is happening, who is behind these monoliths. The latest string of mysteriously appearing monoliths has stunned people across the world. Now 2 new metal structures have appeared in yet another corner of the world, this time in Poland. These structures are similar to those found in Utah, Romania, California and UK. One of two monoliths was spotted at a nature reserve in the city of Kielce, and the other one on the riverbank in the Polish capital Warsaw. No one claimed responsibility for the installation of the monoliths as of Thursday. This puzzling mystery has so far reached at least nine countries.