The next day the monks reached Nakhon Phanom only to discover that the Phrathat Phanom was already completed. So they took the same route in order to take the relics to their hometown and place them there. On the way back, the monks stopped at the same spot where they had set camp previously and were surprised to see the dead tamarind tree in full bloom. This prompted the monks to build a temple on this sacred ground and they decided to house the Buddha relics in this temple rather than taking them to their hometown. The temple was named Phra That Kham Kaen, which roughly translates to the stupa of the tamarind hardwood. The city too ended up deriving its name from this temple.
Phra That Kham Kaen is located in Wat Chetiyaphum. It dates back to the 20th century A.D. Today, the temple is beautifully renovated and landscaped. Visitors marvel the beauty and the scenic views. The best time to visit the temple is when the annual celebrations take place. These celebrations are held on the full moon day of the 6th lunar month.
Khon Kaen Travel Guide : Phra That Kham Kaen