Guild Wars 2

To be honest, I knew this bug for quite some time. I used the place as a “fortress of solitude”, even fantasized that I would eventually find an NPC there with such advanced AI that we would become friends xD

To get there, you need Lean Techniques (and maybe Advanced Gliding, not sure). First climb to the top of The Great Tree and fly to the nearest updraft, and after to the one on it’s right, and to the branches of the tree to take a rest. When flying endurance is full, fly directly to the highest platform on the cliff right ahead. Use lean forward skill at all times. On the cliff to the right, there is an opening where you can pass and reach the no man’s land.

Screenshots as follows. First image shows the location of the opening.
https://s4.postimg.org/dn2zyx8v1/gw002.jpg
https://s3.postimg.org/5yp1bznab/gw003.jpg
https://s3.postimg.org/gjyc4i8kj/gw004.jpg
https://s4.postimg.org/cy96lu18t/gw005.jpg
https://s3.postimg.org/qexnok4gz/gw006.jpg
https://s4.postimg.org/elv8oa0d9/gw007.jpg
https://s3.postimg.org/62detiodv/gw008.jpg

Btw, kudos to the people who designed the lay energy man ghost thing, it even pops up there!