There are many massive cave systems hidden within the town of Peñablanca in Cagayan Valley. The most famous of these is Callao Cave. Another cave worth visiting nearby is the Sierra Cave—a network somewhat similar to the spelunking caves of Sagada, where one has to twist and contort their body to squeeze through tight openings. This stands in stark contrast to the absolute vastness of Callao Cave, which boasts a huge underground dwelling with a cathedral-like entrance as wide as the gates of a Gothic palace.
Chamber Hopping at Callao Cave in Cagayan
After a brief rest in Tuguegarao, we proceeded to Peñablanca by taking a 45-minute tricycle ride. Callao Cave is located directly beside the scenic Pinacanauan River, where we later witnessed the breathtaking circadian flight of over a million bats.
The Natural Chapel Chamber
To those who have already experienced how physically demanding it is to explore the deep chambers of Sumaguing Cave in Sagada, you will be delighted to know that here in Callao Cave, only minimal physical effort is required to enter its almost magical chambers. One only needs to climb a concrete staircase of a couple hundred steps before laying eyes on the small, picturesque chapel erected directly inside the main cavern.
This space is highlighted by a simple rock altar positioned perfectly beneath a natural skylight opening. At a specific time during the day, when the sun moves directly overhead, it produces a spectacular, almost divine beam of light that stabs straight through the cave’s darkness.
Once inside, we easily navigated through the cave's seven grand chambers—with each chamber illuminated by a sort of natural reverse wormhole at the ceiling. We marveled at massive limestone rock formations: the stalactites clinging tightly to the ceiling, and the stalagmites rising triumphantly from the cave floor.
King, Queens, and Rock Formations
If you remember your spelunking guide in Sagada pointing out shapes resembling "Kings and Queens," the guides here in Callao Cave also have their own imaginative associations for the unique rock formations found within. Some of the most notable include the Lion's Head, the Dog's Head, the Praying Angel, the Elephant's Head, the Rocket, and the Skeleton.
We arrived relatively late in the afternoon, so we unfortunately missed witnessing the famous midday sunlight effect. Our guide, "Andoy," described the midday light show as incredibly dramatic—something that makes you half-expect the voice of God to suddenly boom out from the heavenly beam.
Andoy also noted that Callao Cave is just the tip of the iceberg when it comes to the vast network of cave systems found hidden throughout Peñablanca. To date, there are more than 300 known caves in the area, and many more are still actively being mapped and explored by spelunking groups. This information immediately registered in my head alongside a mental note that said: "More reasons to come back—spelunking galore."
The prehistoric cave dwellers of mankind's early days must have absolutely loved this place; it truly is a prehistoric sanctuary. If we have crowded urban centers like Makati and Quezon City today, during the ancient era, cavemen probably crowded this part of Peñablanca. I imagine the "socialite" cave dwellers hosted underground gatherings of their own. It was the 90210 of the Paleolithic era—or so my funny, wandering thoughts suggested.
If these towering wall formations could talk, they would surely share fascinating tales from the distant past. I have always been deeply interested in the early humans who sought refuge in these subterranean worlds when no constructed infrastructures existed. Today, the walls of the cave stare back blankly, seemingly unperturbed by the passage of thousands of years—though tragically disturbed by modern visitors foolish enough to leave graffiti. These subterranean worlds hide profound secrets that we are only just beginning to unearth, highlighting the urgent need for their ongoing preservation.
The Mystery of Callao Man
And unearth them we did. A group of archaeologists from the University of the Philippines recently discovered ancient human fossils deep inside Callao Cave that are believed to be significantly older than the famed "Tabon Man" of Palawan. The remains of these early inhabitants are pegged at an astonishing 67,000 years old, compared to the 50,000-year estimated age of Tabon Man.
Archaeologists now proudly refer to these remains as "Callao Man." Ongoing studies are attempting to determine whether Callao Man belongs to a fully developed human species or represents a branch of human speciation that took place long before modern humans dominated the earth. I am fascinated to research this potential "missing link" theory further.
Visiting Callao Cave in Peñablanca isn't just a trip that satisfies your nature-loving spirit—it is a rare opportunity to literally walk through human history. With its mythical rock formations and cavernous chambers, it offers a tangible glimpse into the ancient lives of early mankind.
We wrapped up our tour inside Callao Cave in just about 30 minutes. It was a short but incredibly sweet undertaking as we geared up for our kayaking stroll along the nearby Pinacanauan River—which we had heard was phenomenally scenic. As the next chapter of our journey revealed, it was everything it was advertised to be.
Planning your own expedition to Northern Luzon? Check out our complete Cagayan Travel Guide: Nature Spots & Itineraries for top attractions, transport tips, and historical highlights.
