"Huayna Picchu is the landmark peak at Machu Picchu from which the classic, shot-from-above postcard photos are typically taken. While the views are spectacular, of course, the trail is not easy, studded with precarious, sometimes uneven stone steps, and often directly flanked by sheer drop-offs (thus probably out of the question for anyone with a fear of heights). While most hike to the top and back, you can also go up and around to the other side, with a visit to the Temple of the Moon/Great Cavern along the way. Admittance to Huayna Picchu is limited and sells out two or three months in advance; pay for your entrance as part of your Machu Picchu admission."