I was just messing around with Sombra in a skirmish earlier today and I found a glitch to get on top of the sky limit. Here's what you need to do:

1. Play a game as Sombra on Temple of Anubis (I recommend a Custom Game with 0 cooldown)

2. Get to the bridge at the first choke-point and look at the pillar to the right (left if on attack)

3. Throw the teleporter so it bounces off the pillar wall and goes above the sky limit. This might take a few tries, but you'll get it.
4. Have fun messing around!

Here are some images of things I did:

A little hidden area behind the map


Above the second checkpoint


Behind the giant temple


Share what you did, and all thanks are appreciated!