Peru The Grand Tour, 21 Days 20 Nights (travel agency). Retrieved 2007-08-18. [...] hike Huayna Picchu the pyramid-shape mountain above Machu Picchu, walk to the Inca Bridge a secret entrance used by the Inca's army, or toward the Inca Trail to find the historic Sun Gate. ↑ MachuPicchuPeru (2006-01-26).