The Basilica of Corpus Domini is a Roman Catholic church in Turin, northern Italy, built to celebrate the "Miracle of the Eucharist" which, according to various sources, occurred in 1453 during the war between the Duchy of Savoy and France.
The interior has a single nave, and was largely renewed in the 18th century. The high altar is the original one, created by Francesco Lanfranchi in 1664. The interior also houses a slab marking the exact place of the miracle.
( Text quoted from : http://it.wikipedia.org/wiki/Basilica_del_Corpus_Domini )