To walk along a corridor in your dream signifies a transitional phase of self exploration. It signals spiritual enlightenment, emotional growth, physical prowess, new opportunities and mental passages in your life.
If you are walking through a long corridor, then it represents your desperation in trying to escape a repetitive situation or some behavior patterns. You need to free yourself of this repetition. Alternatively, it symbolises the choices and options that are available to you. You have a lot of things to consider.