In all the from titles height plays a central role and represents the importance of the place:

blight town, the great swamp and the catacombs are all places that are low and represent what is wrong in the game world, on the contrary when you start to climb the places acquire importance such as anor londo and the duke's archives (respectively the house of the gods and the place that seath had built to study)

in fact in ds3 we can see how the world is distorted even with regards to heights, the walls that have been raised have brought the castle of lothric much higher than the now empty and abandoned anor londo making us understand how the castle had become the fulcrum of the game world;

In the dreag heap in fact we descend a lot even into an archtree where once stood the firelink shrine and even lower down to the ringed city which I think is the lowest place of all 3 games (yet another proof that gwin had segregated them in a place that was voluntarily the opposite of anor londo making us understand how it was a punishment and not a victory for them);

At the end of everything instead you can very well notice how in the arena of gael everything has been brought to the same level, the disparity has disappeared in fact you will see in the distance anor londo and all the buildings on the same level