he temple is orientated towards the east, and so its buildings are set back to the west inside enclosures elongated along the east-west axis. Because the temple sits at the exact centre of Angkor Thom, roads lead to it directly from the gates at each of the city's cardinal points. The temple itself has no wall or moats, these being replaced by those of the city itself: the city-temple arrangement, with an area of 9 square kilometres, is much larger than that of Angkor Wat to the south (2 km²). Within the temple itself, there are two galleried enclosures (the third and second enclosures) and an upper terrace (the first enclosure). All of these elements are crowded against each other with little space between. Unlike Angkor Wat, which impresses with the grand scale of its architecture and open spaces, the Bayon "gives the impression of being compressed within a frame which is too tight for it.

source: http://en.wikipedia.org/wiki/Bayon