The Cottingley Fairies were a series of photographs taken by cousins Elsie Wright and Frances Griffiths in 1917, depicting them interacting with what appeared to be real fairies. The images, taken in Cottingley, England, gained widespread attention and were famously endorsed by author Sir Arthur Conan Doyle as evidence of the supernatural. Despite skepticism, the photographs captivated the public for decades. It wasn't until the 1980s that Elsie and Frances admitted the photos were a hoax, created using cardboard cutouts and clever photography tricks.