Callao Cave

Callao Cave is one of the limestone caves located in the municipality of Peñablanca, Cagayan province, in the Philippines. The seven-chamber show cave is one of 300 caves that dot the area and the best known natural tourist attraction of the province. The town is named as Peñablanca (Spanish for white rocks) for the presence of white limestone rocks in the area. Callao Cave is located in the Barangays of Magdalo and Quibal in Peñablanca about 24 km (15 mi) northeast of Tuguegarao City, the capital of the Province of Cagayan.

A newly-described species of human living between 50,000 and 67,000 years ago, Homo luzonensis, discovered in the cave was confirmed in 2019. Callao and the other caves are situated in the western foothills of the Northern Sierra Madre Mountains of the Philippines. They are situated within the Peñablanca Protected Landscape and Seascape, which stretches from the caves to the eastern shores of the Pacific Ocean.