Q13. The 'pounding feet of the tourists' strongly juxtaposes the 'city's fragile stones', characterising the damage caused by tourists in comparison to the frailer nature of the ancient city of Machu Picchu.
Q14. The author is communicating that an organisation, WMF is trying to develop more policies and campaigns to allow tourists to practice sustainable tourism, with the preservation of sites under threat like Machu Picchu in mind.
The best thing you could do is read the book, or if in a hurry watch the Anne Frank movie on Netflix, or you can do research on the different side characters like Mr. or Mrs. Van Daan, Mr. and Mrs. Frank, or her sister.
Because they felt like killing
