The Inca Empire was known for its impressive architectural achievements, with many sites still standing today. Notable locations include Machu Picchu, a famous citadel set high in the Andes Mountains, and Sacsayhuamán, a ceremonial complex near Cusco. These sites showcase advanced engineering techniques, including precise stonework and terracing. Inca sites often served various purposes, such as religious ceremonies, agricultural production, and administrative functions. The Inca Trail is a popular trekking route that connects several of these historical locations, allowing visitors to experience the rich cultural heritage of the Inca civilization while enjoying stunning natural landscapes.