Two millennia after the first Christian martyrs' blood stained Rome, the temptation of, and fascination with, religious relics endures. "The Crusades were all about generating relics," says David Morgan, a Duke University professor for religious studies. The series of wars, waged by European Christians to regain the Holy Land from Muslims, saw Crusaders bring back "hundreds and hundreds" of relics from Jerusalem, from Constantinople (modern-day Istanbul) and other places steeped in Christian history. In 1991, the so-called "sacred chin" of St.