Anyway it is in ROTS where Yoda is fighting the Emperor. They are dueling on his platform and Yoda steps on the button that makes the platform rise into the senate chamber. You see it rising up from the floor with the whole empty senate chamber growing around them and you see fierce lightsaber fighting on this tiny little platform dwarfed by this huge symbol of democracy.
The symbolism is amazing in that scene. Very good work with the camera angles and music. To see the last battle for fighting for Republic justice. I couldn't have picked a more appropriate place for that battle. It is the only scene in the entire PT that I like.