The pyramid known as El Castillo rises 24 metres above the Yucatán scrub, its 91 steps on each of four sides summing to 365 when the top platform is counted. Built by the Itzá Maya between the ninth and twelfth centuries, Chichén Itzá served as a political and ceremonial hub until its sudden decline around 1200 CE. The site covers 740 hectares, though visitors explore a compact ceremonial core anchored by the Kukulcán pyramid, the Great Ball Court — Mesoamerica's largest at 168 metres long — and the Temple of the Warriors with its ranks of carved columns. Spanish colonial administrators left the ruins undisturbed until the mid-nineteenth century, when explorers John Lloyd Stephens and Frederick Catherwood published engravings that drew international attention. UNESCO inscribed the site in 1988, and a 2007 online poll named it one of the New Seven Wonders of the World, tripling annual visitor numbers within five years. Chichén Itzá and Valladolid tours from Mérida pair Maya archaeology with Spanish colonial architecture in Valladolid, a town founded in 1543 atop the older Maya settlement of Zací. The drive from Mérida takes 90 minutes eastward along Highway 180, passing cattle ranches and henequen plantations that dominated the regional economy until synthetic fibre collapsed the industry in the 1960s. Most guided day trips depart between 07:00 and 08:00 to reach the archaeological zone by opening time at 08:00, when low sun angles illuminate the pyramid's northern staircase and temperatures hold below 28°C. The combined federal and state conservation fee is 697 pesos for foreign adults as of 2026, paid at the entrance on Carretera Mérida-Puerto Juárez Km 120. Shade is scarce across the plaza, and the limestone pavement reflects heat; midday ground temperatures exceed 45°C from April through September. Valladolid lies 42 kilometres east of Chichén Itzá, a compact grid of pastel stucco houses surrounding the Parque Francisco Cantón Rosado and the Convento de San Bernardino de Siena, completed in 1560 with fortress walls and a cruciform floor plan. The town's cenotes — Zací in the town centre and Dzitnup four kilometres west — offer swimming in limestone sinkholes filled with rainwater filtered through millennia of karst geology. The Yucatán Peninsula holds more than 6,000 mapped cenotes, and the northern corridor between Mérida and Cancún concentrates dozens within short driving distance of major archaeological sites. Many Chichén Itzá and Valladolid tour packages include a cenote stop, typically 45 minutes for swimming and photography, before returning to Mérida by evening.