EUCHARISTIC MIRACLES
Many miracles which have been approved by the Catholic Church are listed on the following website: http://www.therealpresence.org/eucharst/mir/a3.html They include:
Sienna, Italy -- August 17, 1730
Consecrated Hosts remain perfectly preserved for over 250 years. Rigorous 
scientific experiments have not been able to explain this phenomena.
Amsterdam, Holland 1345
Eucharist thrown into fire overnight miraculously is unscathed.
Blanot, France -- March 31, 1331
The Eucharist falls out of a woman's mouth onto an altar rail cloth. The priest 
tries to recover the Host but all that remains is a large spot of blood the same 
size and dimensions as the wafer.
Bolsena-Orvieta, Italy
Again, a priest has difficulties believing in the Real Presence, and blood 
begins seeping out of the Host upon consecration. Because of this miracle, Pope 
Urban IV commissioned the feast of Corpus Christi, which is still celebrated 
today.
Lanciano, Italy -- 8th century A.D.
A priest has doubts about the Real Presence; however, when he consecrates the 
Host it transforms into flesh and blood. This miracle has undergone extensive 
scientific examination and can only be explained as a miracle. The flesh is 
actually cardiac tissue which contains arterioles, veins, and nerve fibers. The 
blood type as in all other approved Eucharistic miracles is type AB! 
Histological micrographs are shown.
Physician Tells of Eucharistic Miracle of Lanciano - (Zenit)
"Dr. Edoardo Linoli says he held real cardiac tissue in his hands, when some 
years ago he analyzed the relics of the Eucharistic miracle of Lanciano, Italy."
SEE ALSO: on FORMED: The incredible Eucharistic Miracles with Fr. Robert Spitzer on the Chris Stefanick Show.
A comprehensive list gathered by Blessed Carlo Acutis: http://www.miracolieucaristici.org/en/liste/list.html