Tourism devalue or add value to heritage icons?

Personally, I feel that tourism actually have both positive and negative effect on the heritage icons. Firstly, tourism add value to the heritage icons as the tourists who visit these icons have a better understanding of these icon and learn more about the country's history and culture. But these heritage icons are significant and represents the country, this adds value as the history and culture are spread and may have influence on the western culture. But tourism devalues the heritage icons as man western food are introduced to ensure the comfortability of the tourists, which are insignificant and does not represent the country. Despite ensuring that the tourists are comfortable in these places, but we must not forget that they are unique because of the significance it holds in that country. Thus I conclude that there are pros and cons to what tourism have on heritage icons.