Gadao's Cave is a small cave site near Inarajan associated with ancient Chamorro pictographs and the legendary chief Gadao. The drawings are not a grand archaeological spectacle, but they are rare, fragile traces of a much older Guam than the Spanish and wartime layers that dominate most visitor itineraries.
Go respectfully and do not touch the cave walls. Access and condition can vary after heavy rain, so ask locally if you are unsure. The site pairs naturally with Gef Pa'go, which gives better cultural context for what you are seeing.