Sacred Destinations Destinations St. Matthias Abbey St. Matthias Abbey Photos 30971 × share full URL share short URL embed link code photo 43 of 76 Previous | Next Shrine of St. Matthias. Relics of Apostle Are Beneath Square Arch The Shrine of St. Matthias. The relics of the apostle are beneath the square arch, in a stone casket in the crypt. Related pages: Credit: Holly Hayes