View image in fullscreenChichén Itzá, Mexico People gather to watch as the shape of a serpent is cast in shadows on the El Castillo pyramid. Sunlight and shadow create the illusion of the serpent deity Kukulcan on the world-famous landmarkPhotograph: AFP/Getty ImagesShareView image in fullscreenToruń, PolandThe USA’s Sara Reifenrath falls on to the track after a collision with Jamaica’s Shana Anderson, during the first changeover of the mixed 4x400m relay at the 2026 World Athletics Indoor ChampionshipsPhotograph: Morgan Treacy/INPHO/ShutterstockShareView image