During two days in Oviedo I managed to visit all 6 WHSs.
The Camara Santa (inside the cathedral) contains valuable jewel encrusted relics.
The Foncalada is an ancient spring located in a niche beneath a busy road junction.
St Julian de los Prades church, 1200 years old contains well-preserved frescoes. I reached it by bus #2 from the city centre.
Sta Christina's church I reached from La Cobertoria railway station where nearby there is a signboard showing several paths leading up to the church, some steeper than others.
San Miguel and Sta Maria churches on Monte Naranco I reached by bus #10 to the Cruces car park, from where there are walking tracks to the respective churches.