This is another photograph of the karst pool called the Sacred Cenote or Well of the Sacrifices. You've got to admit, this green pea soup looks like one heck of a mysterious pool.
When archaeologist Edward Thompson dredged the cenote in 1904, he discovered a thick layer of bright blue silt, 4.5-5 meters in thickness, settled at the bottom of the well remnants of the Maya blue pigment used as part of the rituals at Chichén Itzá. Although Thompson didn't recognize that the substance was Maya Blue, recent investigations suggest that producing Maya Blue was part of the ritual of sacrifice at the Sacred Cenote. See Maya Blue: Rituals and Recipe for more information.
More information on the cenote can be found on this page of the Walking Tour of Chichén Itzá.
