The dilemma is sometimes likened to a double-edged sword.
Historical and natural sites of extraordinary beauty often draw large numbers of visitors to the countries that host them, providing a healthy tourism revenue. However, those same crowds often have a detrimental effect on the places they visit, sometimes leading to significant damage, which has in recent years sparked a debate whether tourist numbers should be capped.
It may sound like a line from a sci-fi novel, but scientist believe that in the near future airplane wings will be able to fix themselves on the go.
A team from Bristol University in England has developed technology which could repair cracks on an aircraft in a similar way that human skin heals.
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