An estimated four million people have descended on the streets of Lyon in central France this weekend for the city’s annual light festival.The event was initially reserved for the 8th of December but due to its popularity was extended into a four day spectacle of light and sound. The festival was inaugurated in 1852 to give thanks to the Virgin Mary, whose statue adorns the hilltop Fourvière basilica. Seventy installations created by artists from around the world are scattered throughout Lyon’s streets and squares. The city’s inhabitants also play their part by placing candles on their windowsills. The festival of lights runs until Tuesday.