Early Cambrian fossils sites of two Natural Monuments of the Sierra Norte de Se-villa Geopark are highlighted. The first of these shows archaeocyath and stromat-olite bioconstructions at the Cerro del Hierro site, one of the most complete and best exposed in the European Cambrian record. The other exceptional setting is the Constantina site, which preserves about 90 discoid structures, which have been interpreted as ancient jellyfish. This site is one of the oldest and best-preserved soft-bodied biotas in the Cambrian record worldwide. Cerro del Hierro also has industrial heritage through its important mining history, which, together with its paleontological value, provides a series of routes that have made it the most visited tourist and educational site in the Geopark. Although the Constantine site is not yet ready to receive visitors, both sites have been proposed as International Geosites and therefore enjoy the maximum Spanish legal protection. © Author(s) 2020.