Ifugao Rice Terraces
Hundred Islands, Pangasinan
Luneta Park, Manila (National hero memorial)
Fort Santiago (Spanish fort)
Intramuros (the walled city)
Corregidor (last stand of the Pacific fleet against the Japanese)
Mayon Volcano (the perfect cone)
Puerto Galera
Boracay Island (fine white beaches)
Chocolate Hills, Bohol
These are all I can think of right now. They are both historic and natural tourist sites in the Philippines.