On the aforementioned solo cycle tour of Angkor I did something that Erin and I didn't do the first time. At the Bayon temple, I took the main (East) enterance.
From a distance The Bayon looks like a weathered, rubble-strewn hilltop. But as you approach and your line of sight to the top is steeper some heads seem to pop over the horizon. It gives you the eery feeling that timeless spirit=guards have awoken and will watch over you as you enter their temple.
It sent chills up my spine. That or my back was dripping in sweat... both are probably true.