The largest Maya city of the Preclassic period, buried deep in the Peten jungle near the Mexican border, and famous for the colossal pyramid of La Danta — by volume one of the largest pyramids on earth. The site has no road. Reaching it means a five-day round-trip trek on foot or by mule from the village of Carmelita, through swamp, jungle, and a string of smaller ruins.
Tour operators in Flores arrange the trek with guides, pack animals, cook, and camp. It is genuinely strenuous, genuinely buggy, and, for the right traveller, the single most rewarding thing to do in Guatemala. A helicopter shortcut exists for those who can afford it.