I was playing on another server because
nG was full as usual on Friday night... There was a teleporter directly outside of the main respawn, so I took it. If I remember correctly, the area I popped up in looked like it was outside, but still somehow under the main building for my team and there was a wheel barrow. Then I went to the right, and was directly outside of the fence that separates the bridge and water from what I thought was the inaccessible area of the map. I don't know what the benefit of teleporting there would be, except that you can build a sentry gun that might be a little more difficult to take out.
Has anyone else seen this? I wasn't hallucinating, other people on my team were teleporting there.
Edit: I tried looking for info on google and youtube, and haven't found anything so far. This isn't the same thing as getting behind the cow, or the "sky walk."