Paris...the City of Lights. Millions of tourists each year are dazzled by it's charm. Yet one of the capital's most impressive features is invisible at street level: its rooftops. From cathedrals to government buildings, the roofs of Paris are unrivaled in beauty and ingenuity. Visit Notre Dame's iconic frame with 210 tons of lead, or the Dome of the Invalides, covered by 500,000 gold leaves.