I just found out that it is possible to see through this top box on the map Chapel.
http://i.imgur.com/7Psb8yv.jpg
Position yourself in the front of the box, like this for example :
http://i.imgur.com/Q3Etepe.jpg
Then all you have to do is jump. Here are some screenshots from different angles :
http://i.imgur.com/P86dNmA.jpg
http://i.imgur.com/B3yodrH.jpg
It only works from this side of the box.
I tried to do it on LAN and online servers and it works on both.
I’m sorry if this has already been reported, I used the search bar but found nothing.