It’s the time we get down and dirty, for caving that is. We now visit Penablanca after at least an hour’s drive from Basilica Minore of Our Lady of Piat. Penablanca is the caving capital of Cagayan Valley. With more than 300 caves in the vicinity, 75 documented and more than 30 being mapped, it’s a spelunker’s haven. Out of the many caves, there are only 2 caves which tourist are allowed to visit for safety and preservation reasons. These are the Callao and Sierra Cave.