Book excerpt: Authors Kate Harper and Val Pitkethly provide clear, authoritative coverage of trekking routes in South America in this new book in the Trekking and Climbing Guide series. The Andes prove a unique climbing experience for the daunting mountaineering challenges, the breathtaking views, and the vibrant cultures and history of the area. Learn the details of the treks and peaks, both accessible and inspirational, before you go. Practical tips on traveling in the Andes and information on trekking styles, local ecological concerns, and mountain photography are also included.