A permanent exhibit of sacred art, located in the church's north tower is open on Sundays, as well as on special request. The collection's centerpiece is an elaborate Neapolitan "presepio" (Italian for creche) from Rome. Among St. John Cantius's many other treasures are a nineteenth-century copy of the icon of Our Lady of Częstochowa adorned with jeweled crowns personally blessed by Pope John Paul II; a reproduction of the famous miraculous crucifix from Limpus, Portugal, a nineteenth-century Pietà from Bavaria, Germany, a hand written altar missal on display, as well as several hundred authenticated relics of saints.