Machu Pichu, in Peru, is visited by almost 500,000 people annually. Thousands of people will clamber over ruins, which means guards have to run after and try to control the tourists so they do not damage the site.
However, the real issues with tourism are on the pathways and the nearby tourist town of Aguas Calientes.
In the town below, in the valley, building has been unrestricted in a confined area, leading to hotels replacing forests along the mountain side. This in turn has caused landslides
Many visitors will take waste with them when they head up the pathway to Machu Picchu but will fail to bring it back, littering on the walkway. Although littering is prevalent everywhere, Machu Picchu is a very important site culturally, so this is very disrespectful to the area and its people. The litter can be seen blowing around the surrounding mountains. Meanwhile, sewage and waste are dumped into the Urabamba river nearby, which is a major source of water downstream.