What are the factors threatening our World Heritage Sites?

From historic monuments ravaged by climate change, to old cities buckling under the impact of tourism, a number of heritage sites around the world are endangered. But, what are the factors affecting these places that mean we might lose them forever?

We've looked at 53 of the World Heritage Sites listed by UNESCO as 'in danger' to determine which types of issues are applying the most strain to these areas, monuments and landscapes.

Hover overClick on the bars in the chart below to see the factors