Machu Picchu is both a cultural and natural UNESCO World Heritage Site. Since its rediscovery in 1911, growing numbers of tourists have visited the site each year, with numbers exceeding 1.4 million in 2017. As Peru's most visited tourist attraction, and a major revenue generator, it is continually exposed to economic and commercial forces. In the late 1990s, the Peruvian government granted concessions to allow the construction of a cable car and a luxury hotel, including a tourist complex with boutiques and restaurants and a bridge to the site. Many people protested the plans, including Peruvians and foreign scientists, saying that more visitors would pose a physical burden on the ruins. In 2018, plans were restarted to again construct a cable car to encourage Peruvians to visit Machu Picchu and boost domestic tourism. A no-fly zone exists above the area. UNESCO is considering putting Machu Picchu on its List of World Heritage in Danger.
Given this paragraph, what is Peru's most popular tourist attraction and how many people visit it every year?
Machu Picchu is Peru's most visited tourist attraction, and a considerable number of people visit it every year. My data shows 1.4 million people visited Machu Picchu in the year 2017.