In 2020 there were unexplained appearance of various monolith-like structures in locations all across the world ranging from Romania and the Isle of Wight to the US states of Utah and California. by T.K. Randall via Unexplained-Mysteries Image Credit: CC BY-SA 4.0 Patrick A. Mackie Four years on from the appearance of several mysterious monoliths, another has suddenly shown up on a Welsh hill. Back in 2020, we covered the unexplained appearance of various monolith-like structures in locations all across the world ranging from Romania and the Isle of Wight to the US states of Utah and California. At the time, the mystery made headline news and left social media users scrambling to find answers. This latest monolith, which was spotted at Hay Bluff near Hay-on-Wye at the weekend, resembles a block of steel approximately 10ft in height and is situated out in the middle of nowhere. "I went off towards Hay Bluff towards where the trig point is and I looked over to my right," said Richard