Slum tourism is a globalizing trend and a controversial form of tourism. Impoverished urban areas have always enticed the popular imagination, considered to be places of ‘otherness’, ‘moral decay’, ‘deviant liberty’ or ‘authenticity’. ‘Slumming’ has a long tradition in the Global North, for example in Victorian London when the upper classes toured the East End. What is new, however, is its development dynamics and its rapidly spreading popularity across the globe. Township tourism and favela tourism have currently reached mass tourism characteristics in South Africa and in Rio de Janeiro, Brazil. In other countries of the Global South, slum tourism now also occurs and providers see huge growth potential.