Basically, I was bored today and began messing around and discovered a few fun places I could get to in khesh city.
First off go all the way up the stairs to this building near the spawn point:
The first and easiest place to get to is under this building; get on this ledge:
Now walk slowly backwards angling off of the edge until you notice yourself halfway stuck in the wall like so:
After you get to this point just jump a few times and if all goes well you will end up under the building. You will probably have to zoom in a little bit in order to see clearly.