An alley is a narrow passageway. If you dream that you are walking through an alley between large buildings, it can mean that you are overwhelmed with difficult choices.
Walking down an apparently endless alleyway in a dream can mean that you are worried that you will never reach your goal.
If you are walking down an alley and find that your passage is blocked, it can be a message that you are taking the wrong approach to solving a problem.
If you dream that a stranger is following you down a dark alley, and you are frightened, that stranger can represent a part of yourself that you do not want to face.
An alley in a dream can symbolize the vagina.