In the Vall d'Àger, the sky is so clear that this is one of the best places in the world to practise astronomy. So don't miss out on the experience and if possible come on a summer's night to admire the shooting stars. Next to this natural spectacle, Parc Astronòmic Montsec proposes projections in the planetarium, exhibitions on the origins of the universe, the formation of the solar system and galaxies, and the geology, flora and fauna of the Montsec, which looks down over the valley.