3. Machu Picchu, Peru
Perched high in the Andes Mountains, Machu Picchu is a 15th-century Incan citadel renowned for its architectural ingenuity and breathtaking vistas. Its precise abandonment remains a mystery, adding to its allure. Designated a UNESCO World Heritage site in 1983, it stands as a testament to Incan engineering and artistry. The site continues to captivate historians and travelers, drawing over 1.5 million visitors annually (UNESCO).
