My Son is a cluster of abandoned and partially ruined Hindu temples constructed between the 4th and the 14th century AD by the kings of Champa. The temples are dedicated to the worship of the god Shiva, known under various local names, the most important of which is "Bhadresvara". My Son is located near the village of Duy Phú, in the administrative district of Duy Xuyen in Quang Nam Province in Central Vietnam, 69 km south-west of Da Nang, and approximately 10 km from the historic town of Tra Kieu. The temples are in a valley roughly two kilometres wide that are surrounded by two mountain ranges. From the 4th to the 14th century AD, the valley at Mỹ Sơn was a site of religious ceremony for kings of the ruling dynasties of Champa, as well as a burial place for Cham royalty and national heroes.
It was closely associated with the nearby Cham cities of Indrapura and Simhapura. At one time, the site encompassed over 70 temples as well as numerous stele bearing historically important inscriptions in Sanskrit and Cham. My Son is perhaps the longest inhabited archaeological site in Indochina, but a large majority of its architecture was destroyed by US carpet bombing during a single week of the Vietnam War. The My Son temple complex is regarded one of the foremost Hindu temple complexes in Southeast Asia and is the foremost heritage site of this nature in Vietnam.
It is often compared with other historical temple complexes in Southeast Asia, such as Borobudur of Java in Indonesia, Angkor Wat of Cambodia, Bagan of Myanmar and Ayutthaya of Thailand. As of 1999, My Son has been recognised by UNESCO as a world heritage site. At its 23rd meeting, UNESCO accorded My Son this recognition pursuant to its criterion C, as an example of evolution and change in culture, and pursuant to its criterion C, as evidence of an Asian civilisation which is now extinct.