Tancama is a small Huastec archaeological site in the hills southeast of Jalpan. It will not overwhelm you with scale, but it has a strong sense of place: stone platforms, quiet slopes, and a reminder that the Sierra Gorda was inhabited long before the mission churches arrived.
The site works best for travellers who enjoy archaeology without crowds. Take water, arrange transport both ways, and pair it with Jalpan's museum so the ruins do not feel like isolated stones in the landscape.