The great sandstone temples of Angkor Wat in Cambodia are crumbling - and some blame the ever-increasing influx of tourists. Not only is there a lot of wear and tear like so many ancient sites, but according to experts, the huge number visitors are using so much water, that the groundwater level has fallen enough to undermine some very old foundations.

Angkor Wat is one of the biggest examples of ancient religious ruins in the world.

Built as a funerary temple by King Suryavarman II in the twelfth century, it was the centerpiece of an urban settlement.

Today the Unesco World Heritage Listed site is a major tourist attraction drawing almost one-and-a-half-million visitors last year.

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