There was a giant natural rock formation in al’naslaa of northern Saudi Arabia that has been sliced in half so perfectly that many believe it took a laser to make the cut. The slice in the rock has been around for thousands of years. And each side has held it's place for untold millennia.
Many debate how they rock split. Some geologists say the ground shifted beneath the rock causing it to crack. Other theories involve volcanoes, pyramids, the makeup of the rock, and aliens. The locals say the rock split happened naturally. But it was split long before their ancestors even existed.
The Internet is baffled. Here's some videos that discuss the theories. You decide. Advanced early human civilizations? Natural forming rock occurrence? Or extraterrestrials?