Geographical position
My Son Sanctuary is set in a small valley belonging 
to Duy Phu Commune, Duy Xuyen District, Quang Nam Province, about 70km 
southwest of Danang City and 40km from Hoi An City. Of the 225 Cham 
vestiges that are founded in Viet Nam, My Son possesses 71 monuments and 
32 epitaphs, the content of which is still being studied.
History 
The Cham Kingdom had two sanctuaries belonging to two
 main opposing clans. My Son of the Dua Clan, ruled over the north of 
the kingdom and was the place for the worship of God Srisana 
Bhadresvara. The Cau Clan, who reigned over the south had Po Nagar 
Sanctuary, dedicated to Goddess Po Nagar. Nevertheless, My Son was 
considered as the sanctuary of the Cham Kingdom. 
The first constructions date back to the 4th
 century under the reign of Bhadravarman for the worship of God 
Shiva-Bhadresvara. But later on, the temple was destroyed. At the 
beginning of the 7th century, King Sambhuvarman had it 
rebuilt and rebaptized Sambhu-Bhadresvara. Each new monarch came to My 
Son after his accession to the throne, for the ceremony of purification 
and to present offerings and erect new monuments, which explains why My 
Son is the only place where Cham art flourished without interruption 
from the 7th to the 13th century. 
Architecture in My Son 
The temples in My Son were built into groups that 
basically followed the same model. Each group was comprised of a main 
sanctuary (kalan), surrounded by towers and auxiliary monuments. 
The kalan, which is a symbol of Meru Mountain (centre of the universe, 
where the gods live) is dedicated to Shiva. The small temples are 
devoted to the spirits of the eight compass points. In the towers, 
topped with tiled, curved roofs, were stocked the offerings and sacred 
objects of the pilgrims. Cham temples do not have windows, so they are 
very dark inside. Windows are only found on the towers. 
 
                                              Cham towers and temples are built of bricks 
associated with sandstone decorations. It is quite noteworthy that no 
adhesive can be seen in between the bricks, which is amazing since some 
of the works have survived thousands of years. The structures were 
built, and only then did the sculptors carve the decorations of floral 
patterns, human figures or animals. This technique is unique in Asia.
Every
kalan in My Son is comprised of three parts: the bhurloka
(foundations), the bhurvaloka (body of the tower) and the svarloka
(roof).
The
bhurloka represents the terrestrial world. It is decorated all the way
round by engravings of patterns, animals, human characters praying under small
vaults, masks of Kala or Makara (monsters), dancers, musicians…
The
bhurvaloka symbolises the spiritual world where, after being purified, men
could meet the ancestors and the gods. It is built with very thick bricks
(about 1m thick), but its height can vary from one monument to the next. The
outside is decorated with pilasters, false doors or windows. 
The
svarloka usually has three storeys in the same style as the base, and
features a main door and other, false, ones. It is decorated with small
sandstone or brick statues representing mythical animals, which are mounts
ridden by gods in the Indian tradition: birds, swans, buffaloes, elephants or
lions. There are small decorative towers at the corners of the 1st
and 2nd storeys. This roof, made of sandstone or brick, can be
either pyramidal or boat-shaped.
Methods used to identify
and categories the style of the My Son Sanctuary
My Son was rediscovered in 1885 by a group of French soldiers. In 1895, C.
Paris, a French scholar, was the first one to clear the My Son Sanctuary. Then,
many scientists came to My Son to study Cham epitaph, sculpture and
architecture such as Henri Parmentier, C. Carpeaux, P. Stern… 
Thanks
to Henri Parmentier, the temples of My Son were classified into groups of
letters (A, A’, B, C, D, E, F, G, H and K), and then numbered according to
their functions. It starts with the main sanctuary, the kalan, (number
1), then the gate tower (number 2), and so on. Even though these categories
break up the architectural complex of My Son as a whole, they are remarkably
efficient for the study and maintenance of the ruins.
In December, 1999, at the 23th meeting of World
Heritage Committee of UNESCO in Marrakesh,
Marocco, My Son was recognised as world cultural heritage based on two
prominent criteria: criterion (ii)
an exceptional example of cultural interchange, with an indigenous society
adapting to external cultural influences, notably the Hindu art and
architecture of the Indian sub-continent and criterion (iii) the Champa Kingdom was an important
phenomenon in the political and cultural history of South – East Asia, vividly
illustrated by the ruins of My Son.