Pasuquin Caves is located in  Pasuquin, Ilocos Norte, Philippines.

The caves, located 1,708 above sea level, have underground water streams and offer some of the more spectacular stalagmite and stalactite formations. Travel time to the caves is 45 minutes from the town proper through a dirt road, and you will need to get a special permit from the major's office to explore the cave. The trip is definitely worth it! You might even be fortunate to meet members of the Itneg tribe, the original inhabitants of the town. There are a few of them still living in the thick forests, untouched by modern civilization.

Source:

Selectphilippines.com