Some places are now sufficiently popular, and the load-up time for the surrounding landscape so slow, that large crowds develop at the landmark point. This is somewhat like the Google Earth problem where loads of snappers take pictures of the same landmark, and upload them to Panoramio, so that when a viewer takes a look at a popular spot it grows a zit-farm of picture markers.
Google have fixed this by spreading out the "zit farm" and linking the same pix with the same co-ordinates together. I would suggest that landmark and infohubs get "fuzzier" the higher their traffic rate - so an incoming av is shifted a few metres in a random direction, and hence doesn't come out right on top of everyone else. Perhaps this would reduce peak loads on sims, too, if everyone gets spat into a kind of roulette wheel thing and then has to turn around to let the rest of the space rez for them...
Just an idea!