Cal Orck'o is one of the most extraordinary palaeontological sites on earth: a near-vertical wall of limestone, about 80 metres high and over a kilometre long, covered in more than 5,000 dinosaur footprints made by some 300 distinct animals around 68 million years ago. Sauropods, theropods, ankylosaurs, ornithopods — every major dinosaur group of the late Cretaceous is represented. Many of the trackways run for dozens of metres, including the longest continuous dinosaur trail ever found.
The site sits inside the Fancesa cement quarry on the city's northern edge, and continued blasting has, ironically, both revealed and threatened the tracks. The adjacent Parque Cretácico dinosaur park offers a viewing terrace, guided tours, and a row of life-sized fibreglass dinosaurs that delight children. The viewing terrace is some distance from the wall — bring binoculars or a telephoto lens — but the guided tours (small extra fee, usually in Spanish or English) walk you down to the foot of the cliff for a closer look. Dino Bus tours from the centre of Sucre depart twice daily and include transport and entry. Visit in the morning when the light is best.