Wat Phra That Phanom is the
sacred precinct of the
Phra That Phanom chedi, located in the
district of the same name, in the southern part of
Nakhon Phanom Province,
northeastern Thailand. According to legend, this structure contains The Buddha's breast bone, and as such, it is one of the most important
Theravada Buddhist structures in the region. It was originally built in the 16th century by the Laotian King
Setthathirath of Lanxang. Each year, a festival is held in That Phanom to honor the temple. This festival lasts for one week, during which thousands of people make pilgrimages to honor the shrine.
According to a Fine Arts Department marker on the site, it fell down in 1975, but was rebuilt with funds raised by public subscription, and from the government.
In Thai folk Buddhism, Wat Phra That Phanom is a popular pilgrimage destination for those born in the
year of the Monkey.
Reference from wikipedia.org/wiki/Wat_Phra_That_Phanom
I've been there on June with my friend. Good travelling but so hot.