The plan of the Bayon is presented on three separate levels. The first and second levels contain galleries featuring the bas-reliefs. A 16-sides central sanctuary dominates the third level, which is cruciform in plan. Despite this seemingly simple plan, the layout of the Bayon is complex due to later addition, a maze of galleries, passage and steps, connected in a way that makes the levels practically indistinguishable and creates dim lighting, narrow walkways and ceiling.

Besides the architecture and the smiling faces, the highlight of Bayon is undoubtedly the bas-reliefs. The bas-reliefs on the inner gallery are mainly mythical scenes, whereas those on the outer gallery are a marked departure from anything previously seen at Angkor. They are unique and contain genre scenes of everyday life–markets, fishing, festivals with cockfights and jugglers and so on–and historical scenes with battles and processions. The bas-relies are more deeply carved than at Angkor Wat. But the representation is less stylized. The scene are presented mostly in two or three horizontal panels. The lower one, with an unawareness of the law of perspective, shows the foreground, whereas the upper tier presents scene of the horizon. they both exhibit a wealth of creativity. Description of the bas-reliefs in this guide follow the normal route for viewing the Bayon. They begin in the middle of the east gallery and continue clockwise. Visitors should keep the monument on their right.