Great Cathedral Mystery on NOVA
â€œGreat Cathedral Mysteryâ€ premieres tonight on NOVA. The great cathedral in Florence features the largest masonry dome on earth â€“ over forty stories tall! How they managed to build it 600 years ago is a mystery that has confounded historians and engineers. Tonight, NOVA tests the latest theories about its construction. Watch tonight or set your DVR at 9pm on WOSU TV.