Tham Krai Phet is a beautiful and wonderful cave. Inside the cave are stalagmites and stalactites that look like grains and sparkles when shining like a diamond all over the place. The appearance of the cave is deep under the soil surface, like a palace under the ground. Each part of the cave has its own unique beauty, and there is an interesting legend to be researched and proven. It is located at Ban Phon Sawang, Village No. 3, Na Dok Kham Sub-district, Na Duang District, Loei Province, 13 kilometers from the district office and the path to the cave is a paved road. The history of this cave: There is a monk named "Luang Por Chuay" went on a pilgrimage to practice meditation at this place and saw a vision that there was a cave in this area which sparkles like diamonds and very beautiful. After searching, he found the mouth of the cave, and went to explore the cave and found the light that shines out like a diamond sparkling therefore named it "Tham Chuay Rattanatrai Krai Petch"