Machu Picchu
Travelers in search of Instagram-worthy vistas and a once-in-a-lifetime adventure should consider visiting Machu Picchu. Nestled within a tropical Peruvian forest almost 8,000 feet above sea level, this UNESCO World Heritage Site can only be reached by hiking the 27-mile Inca Trail or taking a train to Aguas Calientes. Once on-site, visitors can learn about some of the theories surrounding Machu Picchu's existence as they explore its approximately 200 religious, ceremonial, astronomical and agricultural structures. When it's time to retire for the night, stay in nearby Cusco, which sits about 45 miles southeast of the Inca Trail trailhead.