Notre Dame Cathedral, the beloved landmark in the heart of Paris, was engulfed in flames last night. The anguish and disbelief as Persians watched the historic structure burn soon filled social media. CNN's Hadas Gold said people crowded the banks of the Seine to gaze helplessly at the unthinkable. Many Parisians, who grew up with the gothic structure towering over the river, burst into tears. Many hugged each other as the church succumbed to flames and billowing clouds of smoke.