The ubiquity of travel has led to overcrowding by tourists at some of the world's best-known vacation destinations and visitor attractions. Huge crowds are causing environmental degradation, dangerous conditions, and the pricing-out of locals who feel overrun and overlooked as their communities splinter under the weight of foreign footfall. Historically, bad planning and economic recession has led to the closure or abandonment of a number of fine buildings. And at the lowest end of the scale, wanton vandalism has been blamed for the destruction of several natural landmarks. So, what's going on?
Browse this gallery and find out more about the consequences of unsustainable tourism.