Bare 1,000 m. high mountains to the northwest of town. Khao Kho was a base from which communist insurgents conducted their struggle from 1968 to 1982.
It is accessible via two routes: off Highway 12 (Phitsanulok-Lom Sak) at Ban Camp Son, and off Highway 21 at Ban Na Ngua, about 13 km. north of town.
Both routes wind through steep terrain. Interesting places include various viewing points, remains of guerrilla bases, a war memorial, an arms museum, a stupa containing a holy relic, the Si Dit Falls and a royal palace.