Yale-affiliated explorer Hiram Bingham arrived at the Machu Picchu ruins on July 24, 1911, guided by local residents—an event that initiated sustained 20th-century archaeological attention and international publicity for the site.
Backed by Yale University and the National Geographic Society, Bingham’s 1912 expedition undertook systematic clearing, mapping, photography, and excavation work at Machu Picchu, helping establish the site as a major focus of professional research.
The April 1913 National Geographic issue published Bingham’s illustrated report, amplifying worldwide awareness and cementing Machu Picchu’s importance to both archaeology and public imagination.
Peru established the Instituto Nacional de Cultura (INC), strengthening national administration for cultural heritage—an institutional foundation that later shaped management, conservation, and research oversight at Machu Picchu.
Peru created the Historic Sanctuary of Machu Picchu as a protected area encompassing both the archaeological complex and its surrounding ecosystems, formalizing conservation priorities alongside research and visitation.
UNESCO added the Historic Sanctuary of Machu Picchu to the World Heritage List as a mixed (cultural and natural) property, increasing international conservation scrutiny and strengthening the framework for long-term research and site management.
Machu Picchu was named one of the “New Seven Wonders of the World” in the 2007 global vote, further accelerating international tourism pressures that shaped subsequent management decisions affecting research access and preservation.
Peru escalated its long-running dispute with Yale by filing suit seeking return of Machu Picchu materials excavated during early 20th-century Yale expeditions—an episode that affected stewardship debates and scholarly access arrangements.
Yale and the Government of Peru reached an agreement (November 2010) for the return of Machu Picchu archaeological materials, setting the terms for repatriation and new collaborative research and curation structures in Cusco.
In February 2011, Yale and the Universidad Nacional de San Antonio Abad del Cusco (UNSAAC) signed an agreement establishing a joint center dedicated to display, conservation, and study of the Machu Picchu collections in Peru.
Yale began shipping Machu Picchu materials back to Peru in March 2011, initiating phased repatriation intended to have key objects in Peru for the 1911–2011 centennial commemorations.
Cusco’s Casa Concha began operating as the Museo Machu Picchu, providing a public-facing venue in Peru to exhibit and study returned materials from the Yale collections.
A final shipment in November 2012 completed the return of Machu Picchu materials from Yale to Peru, concluding a high-profile dispute and consolidating collections-based research capacity in Cusco.
After a closure of nearly a month amid major political protests and transport disruptions, Peru officially reopened Machu Picchu on February 15, 2023—highlighting the site’s vulnerability to external disruptions affecting both tourism operations and on-site work.
From June 1, 2024, access rules emphasized fixed circuits and timed entry to reduce crowding and protect sensitive areas—measures that also shape how researchers, guides, and conservators coordinate movement and monitoring in the sanctuary.
Peru’s Ministry of Culture established a maximum daily capacity of 5,600 visitors on designated 2026 high-season dates (and 4,500 on other days), reflecting ongoing technical and policy efforts to balance conservation needs with tourism demand.
20th-century archaeological research at Machu Picchu (1911–present)
