Callao Cave, Penablanca, Cagayan Valley

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Panorama by: Rommel Bundalian
Callao Cave - Located just outside Peñablanca town proper, this cave has seven chambers which are all explorable. The guide says that there are more than seven chambers but the others are not yet open to the public. The cave has great rock, limestone and mineral formations. It also has two skylights and a man-made chapel inside Chamber 2.- WikiPilipinas

Magat Dam at Magat River

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Panorama by: Rommel Bundalian
Magat Dam is a large rock-fill dam on the island of Luzon in the Philippines. The dam is located on Magat River, a major tributary of Cagayan River. Constructed in 1983, Magat Dam is one of the largest dams in the Philippines and has two primary purposes: as a source of irrigation water and as a provider of hydroelectric power.
The Magat Dam is located on the Magat River at the boundary between the municipalities of Alfonso Lista in the province of Ifugao and Ramon in Isabela both on the island of Luzon. The Magat River is the largest tributary of the Cagayan River, the longest river in the country.
-wikipedia