"Then [Jesus] said to Thomas,
'Put your finger here and see my hands,
and bring your hand and put it into my side,
and do not be unbelieving, but believe.'"
Above is the relic of the finger of St. Thomas, part of the collection of relics kept at the Basilica of the Holy Cross in Rome. This past January, I took my tour group there to see this, and a few other great relics of the Lord's Passion.
For more on the basilica and the relics it contains, click here.