"Before him, across the bridge, the stone fortress rose like a mountain. Aching and depleted, Langdon broke into a loping run. On both sides of him now, like a gauntlet of escorts, a procession of Bernini angels whipped past, funneling him toward his final destination. Let angels guide you on your lofty quest. The castle seemed to rise as he advanced, an unscalable peak, more intimidating to him even than St. Peter's. He sprinted toward the bastion, running on fumes, gazing upward at the citadel's circular core as it shot skyward to a gargantuan, sword-wielding angel." (Dan Brown: Angels and Demons, 2000).