Machu Picchu
Inca Empire · Cusco, Peru · 1450
Machu Picchu is an Inca citadel, likely built as an estate for the Inca emperor Pachacuti. Its construction around 1450 CE showcases sophisticated dry-stone masonry, where carved blocks fit together without mortar. Significant features include the Intihuatana, the Room of the Three Windows, and the Temple of the Sun, all demonstrating precise astronomical alignments and integration with the natural mountainous landscape. The site's terraced hillsides, elaborate water systems, and distinct sectors for agriculture, urban living, and religious ceremonies exemplify Inca urban planning and engineering prowess. Its remote location in the Andes Mountains protected it from Spanish conquest, preserving a unique example of Inca architectural and cultural heritage. It was designated a UNESCO World Heritage Site in 1983.