The Living Subterranean Sierra Cave

The Pillars at Sierra Cave, Cagayan Valley

The Pillars at Sierra Cave, Cagayan Valley

Callao Cave may be the more popular cave in the Penablanca’s Callao Cave National Park but the subterranean Sierra Cave, located only 20 meters away is a perfect example of a living cave. It’s a perfect cave for studying speleothems due to its pristine and well preserved state.