Hoyop-Hoyopan Caves – about 15-km from Legazpi, the name means “blow-blow” in the local dialect from the sound of the wind whistling through the main entrance. Archeological artifacts dating from 50 B.C. were excavated by a Franciscan priest and are now housed at the National Museum in Manila and nearby Camalig Church.
Calabidongan Caves – 2-km from Hoyop-Hoyopan, these caves feature an underground stream and a population of bats. Pottery, human bones, beadwork and other artifacts believed to be 4,000 years old have been found and can be seen at Camalig Church.
Del Rosario Caves – located near Jovellar, a grotto-like cavern on a hillside.
Minaroso Caves – on Batan Island located close to the sea and is a haven for seabirds and swallows.