1.5 hours from Puebla. Within the town there is a small fossil museum and a site featuring some camel and other animal tracks forever captured in mud. Millions of years ago Tepexi was covered by an ocean, and later a lake, hence the fossils. Outside the town, perhaps 30 minutes down a gravel/dirt road, you’ll find your biggest reason for coming to Tepexi: the site of Tepexi el Viejo, a Prehispanic fortress. Judging by the pottery shards everywhere and the unofficial pathways, the site seems as yet to be unexcavated, though it is protected by the INAH.