Throughout time and across all cultures, a knot has been used to symbolize tension and struggle. The undoing of a knot symbolizes freedom from these burdens - a release of pressure. In the tradition of Mary, Undoer of Knots, Pope Francis' favorite artwork, locals and visitors of the grotto are able to add or remove knots here at the Cathedral Basilica of Sts. Peter and Paul, symbolizing their personal struggles and sharing the burdens of others. #GoodIsWinning #wmf2015 #undotheknots #mercyandjustice #knottedgrotto