Phu Hin Rong Kla is the National Park of Thailand. This is one of the most attractive places and travel destinations of Thailand. It is situated in three provinces; Phisanulok, Loei and Phetchabun which are in the lower Northern part of Thailand. (only approx. kgs. from Bangkok)
cr. pic. http://thaiastro.nectec.or.th/activity/25511128_phuhinrongla/In the old days, it was an important battlefield between the Thai military and the Communist forces. ( - ) They fought seriously several times during that period. Phu Hin Rong Kla was indeed the perfect base for the Communist forces since it is in the remote area and it is very close to mountains; the Communist forces could hide and reside among the densely forested hill which is difficult for the Thai military to find. By the way, the Thai military could finally defeat the Communist forces in . It was partly because the Thai Government at that time granted amnesty to all students who had joined the Communist forces.
cr. pic. https://sites.google.com/site/nipaporndansai11/phu-hin-rxng-kla
Nowadays, the Communist headquarter office bases are ones of the most tourist attractions and travel destination of Thailand; you can find a peaceful environment there. Once you arrive at Phu Hin Rong Kla, you can feel like you are in a million miles away. In the meantime, you may wonder how the Communist forces can survive in such an environment. But, when visiting their amazing places where necessary facilities were set up; i.e. the state power office, political and military school, water turbine, the raid shelter, etc, you may be understand and can imagine about the way of their living.
Apart from this area, Phu Hin Rong Kla also provides beautiful nature; i.e. awesome waterfalls and unusual nature like a large marvelous stone platform or rocky grounds which have strangely shaped; you can find jagged rock formations spreading over a wide area called Lan Hin Phum, which is a popular place where you can see beautiful sunset as well. Besides, there are also long deep cracks in some places (Lan Hin Teak). These may be caused by earthquakes. Walking along those rocks is very much exciting esp. when you look into the depth of the broken rocks. By the way, you can jump across some broken rocks which are narrow. Moreover, you can climb high to Pha Chu Thong Cliff where the Communist forces raise a red flag whenever they won the Thai Military. Furthermore, there are many kinds of plants growing in the broken rocks; i.e. mosses, fern or ground orchids which are very beautiful. The weather at Phu Hin Rong Kla like the weather at Phu Kradung which is cool through out the year.
Anyway, for the forest hiking trails, I would recommend you to hire a guide as it is very vast area and you may get lost accordingly. In the meantime, you may stay overnight there as tents and accommodations are available.
If you are a nature or mountain lover, I can say that Phu Hin Rong Kla, Thailand, can be your travel destination.