Scientists discover ancient Mayan city hidden under Guatemalan jungle | Archaeology | The Guardian
El Caracol – Chichen Itza, Mexico - Atlas Obscura
Sky & Telescope - 📍Panoramic view atop El Caracol Observatory, Chichén Itzá. Few ancient civilizations achieved the celestial sophistication of the Maya in Mesoamerica. Their astronomer-priests looked to the heavens for guidance
Mayan astronomy for 2012: Looking ahead | University of Oxford Department of Physics