-This part of the city, now protected from river flooding, became the center of power.

♪ Many building foundations have been discovered there, including what archaeologists suspect could be a vast palace.

The existence of such a palace would prove there was an elite group ruling the capital of the Shu kingdom.

Sanxingdui was organized rationally -- a zone for power, another for the population, and another for sacrificial activities.

The size and careful organization of Sanxingdui suggest that it was the capital city of the Shu kingdom.

The city possessed sophisticated sculptures and was filled with imposing buildings.

These details point to a highly developed civilization, that of the Shu kingdom, set apart from the Central Plains.

But why were these pits dug and filled with the kingdom's most precious resources?

-[ Speaking Chinese ] -These six sacrificial pits, dug at the same time, contained the most precious and important objects of the Shu state.

-After being destroyed and burned, the objects were buried so they would never be seen or used again.

In a sense, these pits became the tomb of Sanxingdui itself.

-[ Speaking Chinese ] -We can be almost certain that these six pits date from the final period, when Sanxingdui served as the ancient Shu capital.

-Dating back 3,000 years, the pits seem to mark the end of Sanxingdui.

But archaeologists aren't aware of any other civilization that buried its most precious possessions.

What happened?

Did the inhabitants abandon the city?

Were they forced out?