The most important buildings at Kabah, which means "lord of the powerful hand" in Mayan, were built between AD 600 and 900, during the later part of the classic era. A ceremonial center of almost Grecian beauty, it was once linked to Uxmal by a sacbé, at the end of which looms a great independent arch—now across the highway from the main ruins. The 151-foot-long Palacio de los Mascarones, or Palace of the Masks, boasts a three-dimensional mosaic of 250 masks
of inlaid stones. On the central plaza, you can see ground-level wells called chultunes, which were used to store precious rainwater. The site officially opens at 8 am, but the staff doesn't usually show up until 9.