Don't expect history - this is a fantasy movie with a quite simple story. Good computer animation and fighting scenes. Overall certainly not one of the better y movies of its genre, but still entertaining.
1700 years to build. 5500 miles long. What were they trying to keep out?
The film is set in ancient China and Matt Damon's character is a mercenary who travels east in search of gunpowder and discovers the mighty Great Wall and the terrible secret behind why it was built. This savage tale of man vs. nature will leverage the world class visual effects of Weta to create an entire ecosystem of creatures hellbent on our destruction.