The Callao Caves Tourist Zone of Penablanca, Cagayan is 24 kilometers from Tuguegarao. The seven-chambered Callao Caves boast of massive limestone and other rock formations, skylights and a chapel. Other pristine and undisturbed caves with living rock formations in the area include Sierra Cave, Quibal Cave, Odessa-Tumbali Cave System, Jackpot Cave, Roc and San Carlos Caves, among others. These caves can be explored with guides from Sierra Madre Outdoor Club (SMOC), Adventures and Expedition Philippines, Inc. (AEPI) and North Adventuours . More than 300 caves dot the area, 75 of which have been documented by the National Museum since 1977. Within the area is the Pinacanauan River conducive for river rafting or boating, kayaking, fishing and swimming while the mountains are perfect for trekking and mountaineering. Daily Circadian Flight of bats from a bat cave occur at dusk. Passenger jeepneys leave Don Domingo Public Market in Tuguegarao City everyday for Peñablanca. The Callao Caves Resort is the only accommodation facility available at the Callao Caves Tourist Zone. Fare is P15.00 per pax one way.