Bottom of the Well

Ocarina of Time's Kakariko Village was home to a well. That well, as well as being the source of power for the Windmill, was also the entrance to an underground chamber, in which the sacred Lens of Truth was hidden. When Link is an adult, the well is sealed, and when he is a child, it is filled with water. In order to enter this chamber then, Link will need to use the Song of Storms to super-charge the windmill and dry the well.