Final answer:
The discovery of Machu Picchu is a subject of debate among historians, with different claims regarding who should be credited. It is generally attributed to Hiram Bingham's 1911 expedition that the lost Inca city was brought to international attention.
Step-by-step explanation:
Just who should be credited with the discovery of Machu Picchu is the subject of some debate. Some historians believe that German businessman Augusto Berns looted Machu Picchu before Hiram Bingham, while others claim that Carl Haenel and J. M. von Hassel visited the site prior to Bingham's arrival. However, it is generally attributed to Hiram Bingham's 1911 expedition that the lost Inca city was brought to international attention.
Learn more about Discovery of Machu Picchu