Perched on a mountaintop above the meandering Urubamba river, and steeped in lush jungle foliage, thick mist, and orchids, the magnificent "Lost City of the Incas" was hidden from the world for centuries. The delicate Incan stonework and awe-inspiring location make Machu Picchu a must-see destination. Your CASSANDRA tour guide will share fascinating theories of how and why it was created, and the threats the ancient ruin faces today.