In 1971, in the Spanish town of Belmez, strange faces began to appear on the kitchen floor of Maria Pereira. Any attempt to get rid of them by scrubbing, tearing out the tiles, cementing the floor was in vain. The faces kept reappearing & seemed to be changing & growing. After excavating the kitchen floor, eventually 9 decapitated skeletons thought to be dating from the 13th century were found. No explanation has ever been found. The phenomenon is said to be ongoing to this day.