At the heart of the Shrine of The Divine Mercy in Kraków-Łagiewniki stands the chapel where the miraculous image of Merciful Jesus and the tomb of St. Faustina are to be found. This small church, consecrated in 1891 and dedicated to St. Joseph, was built within the complex of the convent of the Sisters of Our Lady of Mercy and once served only the Sisters and their wards. This chapel has since witnessed the prayer of the Apostle of The Divine Mercy and the extraordinary graces (including the revelations of Jesus and the Blessed Mother) received by her in this place. With her death, the message of God’s Mercy, which by the will of Christ she gave to the Church and the world, was deposited in this place. For this reason the Łagiewniki Shrine became the centre of devotion to The Divine Mercy, the place from which this message is spread throughout the world and the place to which people from every continent come on pilgrimage. They come asking for many graces, to which the votive offerings in the display cases around the chapel bear witness.
A white marble coffin with the relics of St. Sister Faustina rests on the altar below this image, and one relic has been placed in a marble prie-dieu before the altar, for the convenience of pilgrims wishing to venerate her and ask for her powerful intercession through prayers to The Divine Mercy.