The country known for its ancient ruins of Machu Picchu is **Peru**. This iconic site, built by the Inca civilization in the 15th century, is located in the Andes Mountains and is often referred to as the "Lost City of the Incas." Machu Picchu is renowned for its archaeological significance and stunning architecture, featuring terraced fields, temples, and intricate stone structures that harmonize with the surrounding landscape. In 1983, it was designated a UNESCO World Heritage site and has become a major tourist attraction, drawing visitors from around the globe who seek to explore its history and breathtaking scenery.