Today is the longest day (eight to nine hours of walking) but also the most impressive and interesting because of the amount of archaeological complexes and cloud forest we will find as we walk. After breakfast in our campsite in the verdant Pacamayo Valley we start ascending towards the small but impressively set ruins at Runkuraqay and on to Cochapata set just below the second pass at 3,900m (12,800ft). From here we walk the short distance to the pass and then descend past a mysterious small green lake to the large ruins of Sayacmarca and on to the last pass at 3,800m (12,450ft) which is more like a low ridge-line than a true pass. From here we get a great view down into the forested gorge of the Urubamba River set more than 1700 metres below us. A short hike from here takes us over the Phuyupatamarca Pass at 3,700m (12,140ft), aptly named the ‘City in the Clouds’. We walk down along an incredibly well preserved section of the Inca Trail with great white granite slab walls and staircases all impressively set in high jungle to our final campsite at Wiñay Wayna 2,679m (8,790ft). Overnight: Campsite.