The Oratory of the Santissima Annunziata lies in the small hamlet of Biestro, a kilometre or so from Pallare's centre. Built in 1580, it is older and more interesting than the village's parish church, with frescoes on the interior walls and a painting attributed to the school of Guido Reni. The oratory is a compact stone building with a simple facade that gives no hint of the decorated interior.
Opening hours are irregular and it is often locked — your best chance of gaining entry is to ask in the village or visit on a Sunday morning. Even if closed, the hamlet of Biestro itself is worth the short walk for its handful of old stone houses and the views down the Val Bormida.