The Alongkon Chedi was built in 1876 CE by King Chulalongkorn (Rama V; b. 1853 - 1910) in memory of his and Queen Sunantha Kumarirat's visit to the Phlio Waterfall in 1874.

Namtok Phlio National Park was designated a national park in 1975 and originally called Khao Sa Bap National Park. It covers an area of 135-sq km (52-sq miles) and contains some of Thailand's lushest rainforest. Wildlife within the park includes 32 species of mammals and 156 species of birds. Barking deer; tiger; leopard and Asiatic black bear are among its larger inhabitants.