El Caracol, Chichen Itza

El Caracol, meaning 'snail' in Spanish, is a fascinating observatory structure located at the ancient Maya site of Chichen Itza in Mexico, dating back to around AD 906. This unique building features a spiral staircase and was used by Mayan astronomers to observe celestial events, taking advantage of the flat Yucatán landscape. The structure allowed for the tracking of significant astronomical phenomena, including the cycles of Venus and various equinoxes and solstices, with sight lines for 20 of 29 notable events identified. El Caracol stands as a testament to the advanced understanding of astronomy possessed by the Maya civilization.