Another way to access the world of the Fae was to find a secret entrance. These were typically guarded, but every once in a while an enterprising adventurer would find his way in. Often, he found upon leaving that more time had passed than he expected. In several tales, mortals who spend a day in the fairy realm find that seven years have passed in their own world.
That gate is within, and yet, it opens magic doors everywhere in This reality.