Good Friday, Florence, Italy
It was Good Friday, 1595, in Florence, Italy. A lit candle in the side chapel of a church fell to the ground and started a fire. The people succeeded in saving the Blessed Sacrament and the chalice from the fire, but, in their haste, six fragments of consecrated Hosts fell to the ground. When they were found later, they had joined together but undamaged from the fire. In 1628, the bishop examined these fragments and found them to be still incorrupt. They have been saved ever since and are still available for viewing to this day.
Source: “The Eucharistic Miracles of the World,” a Vatican international exhibition, as reported by The Real Presence Eucharistic Adoration Association, http://www.therealpresence.org/eucharst/mir/english_pdf/Florence.pdf.