In Vega del Rey, keep a lookout for the black pedestrian bridge on your right. Across the highway and up a short but rigorous climb lies one of the most important little churches in Asturias — Santa Cristina de Lena. The climb is steep but brief, and the reward is a UNESCO World Heritage building that's been standing since the 9th century.
Vega del Rey itself is not technically on the current camino route from Campomanes, but it's possible you've arrived here by taking the road from Campomanes instead of crossing the river. If so, use the pedestrian bridge to cross the highway and reach the church.
Vega del Rey is no longer on the main camino from Campomanes, but it is accessible if you've followed the road instead of crossing the river. The pedestrian bridge crosses the busy highway to your right and brings you to Santa Cristina de Lena.