Travel on a Sunday for the chance to experience the street markets ubiquitous across Mexico's pueblos magicos. Peruse the stalls that line cobbled lanes from 9 a.m. to 2 p.m. every Sunday.

The Huastecan Structural Belt curves around the present Gulf of Mexico and the Sierra Madre Oriental parallels it, being both arcs concave to the north. The sialic Precambrian metamorphic terrain of ...