. . "Callao Cave"@en . "Callao Cave is one of the limestone caves located in the Municipality of Pe\u00F1ablanca, 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 attractions of the province. The town is named as Pe\u00F1ablanca (Spanish for white rocks) for the presence of white limestone rocks in the area."@en . .