Faces of Belmez
The Faces of Bélmez is an alleged paranormal phenomenon in a private house in Spain which started in 1971 when residents claimed images of faces appeared in the concrete floor of the house. These images have continuously formed and disappeared on the floor of the home.
Located at the Pereira family home at Street Real 5, Bélmez de la Moraleda, Jaén, Spain, the Bélmez faces have been responsible for bringing large numbers of sightseers to Bélmez. The phenomenon is considered by some parapsychologists the best-documented and “without doubt the most important paranormal phenomenon in the [20th] century”.
Various faces have appeared and disappeared at irregular intervals since 1971 and have been frequently photographed by the local newspapers and curious visitors. Many Bélmez residents believe that the faces were not made by human hand. Some investigators believe that it is a thoughtographic phenomenon subconsciously produced by the owner of the house, María Gómez Cámara (“Thoughtography” is considered a form of psychokinesis among parapsychologists).
Skeptical researchers point out that unlike other psychic claims this case is falsifiable. Since the faces of Bélmez are fixed on whitewash of cement, scientists are able to analyze the molecular changes that took place in such mass of concrete. Skeptics have performed extensive tests on the faces and maintain they have demonstrated that fakery has been involved. [from Wikipedia]