It's all a hoax Jim. This is just cleaver editing no matter which video you watch, student's idea to keep this myth alive. I can't find the video I saw showing how it is done in detail, but it is just mainly a cut in the video between the motion of the camera moving from the first stairway to the other.
Here are some posts that cover it well. But it is lore, sad but true. Sad part, many people have been hoaxed into visiting it with sad outcomes.http://answers.yahoo.com/question/index?qid=20130505183247AACQtIz
Yep, I'd like it to be a quantum gate into a parallel universe and back myself - but until the ETs show us one, I'm afraid we won't see one first hand.