Follow the sacbeob (raised streets) through the thick jungle to explore the Mayan site of Cobá. Not all of its remains have been uncovered - far from it - but from the Gran Pirámide (42 m), topped by the Grupo Nohoch Mul, there is a fantastic view of this vast city made prosperous by the salt trade in the 9C. A fascinating visit which should be repeated when more treasures have been unearthed.