Both the Peñablanca petrographs and the Callao Limestone Formation are included as tentative sites of the Philippines for future inclusion in the UNESCO World Heritage List.

[5] The Callao Limestone Formation has at least 93 archaeological sites that yielded stone tools of Paleolithic industry and bones and shells of animals still living in the vicinity.

However, it also went by other names such as Alimannao, which was said to have been derived from a German rancher named Otto Weber, who, when one of his servants was asked who owned the cows in the area, responded in Itawis: cua na Aliman yao (they belong to the German).

[7] Situated 6 kilometres (3.7 mi) east of the provincial capital Tuguegarao and 475 kilometres (295 mi) north of Manila, the municipality is home to the Peñablanca Protected Landscape and Seascape which contains the Callao Cave (part of the Callao Limestone Formation Paleolithic Archaeological Site), one of the province's well-known landmarks and tourist spots.

Poverty Incidence of Peñablanca Source: Philippine Statistics Authority[13][14][15][16][17][18][19][20] Peñablanca, belonging to the third legislative district of the province of Cagayan, is governed by a mayor designated as its local chief executive and by a municipal council as its legislative body in accordance with the Local Government Code.