Callao Cave

it has a natural cathedral located at the first chamber, which was turned into a chapel by the local people. The conditions inside the cave cause stalactites and stalagmites, particularly in the deeper chambers.Every chamber has natural crevices, which let light get into the cave, serving as illumination for the otherwise dark areas of the place. Other pristine and undisturbed caves with living rok formations in the area include Sierra Cave, Quibal Cave, Odessa-Tumbali Cave System, Jackpot Cave, Roc and San Carlos Caves, among others.

These caves can be explored with guides from Sierra Madre Outdoor Club, Adventures and Expedition Philippines, Inc. and North Adventurer. More than 300 caves dot the area, 75 of which have been documented by the National Museum since 1977. Within the area is the Pinacanauan River conducive for river rafting or boating, kayaking, fishing and swimming while the mountains are perfect for trekking and mountaineering. Daily Circadian Flight of bats from a bat cave occur at dusk.