Between the Angono and Binangonan boundary, National Artist, acclaimed muralist and Angono native Carlos “Botong” Francisco discovered 127 drawings of animal and human figures engraved in the rock surface along with fragments of earthenware, shells and obsidian flakes carbon dated to circa 3000 . and what has come to be known as the Angono Petroglyphs, a cultural heritage site certified by the National Museum (there is a branch of the National Museum onsite). The site was discovered in 1965 and the Angono Petroglyphs represent the oldest known Filipino relic and artwork. The Angono Petroglyphs have been included in the World Inventory of Rock Art under the support of United Nations Educational, Scientific and Cultural Organization (UNESCO), International Centre for the Study of the Preservation and Restoration of Cultural Property (ICCROM) and International Council on Monuments and Sites (ICOMOS) and declared as a National Cultural Treasure by virtue of Presidential Decree 260 and in 1996, it was nominated as one of the ‘100 Most Endangered Sites of the World’ under the World Monument Watch List. Entrance is free, and the site is just before the swanky Thunderbird Resort, there is a small sign that says Angono Petroglyphs, turn right and you will see an old warehouse, follow the dirt road to the right and then when you see the tunnel drilled through a mountain, you may either walk straight through it or ride a tricycle or you may drive your car.