The scenery in the Ordesa Valley I found reminiscent of that of Yosemite: high rock walls with numerous waterfalls. I reached the park by travelling by bus from Sabananigo (on the Jaca to Zaragoza rail line) to the attractive village of Torla. After paying the 4.50 euros to enter the Ordesa National Park I boarded the free bus that stopped first at the visitor centre at the entrance to the park, then at the Pradera car park inside the park. This is the starting point for a number of walking tracks around the park. By following the Rio Arazas to the WHS plaque I reached the view of Mount Perdido.