Rio de Janeiro in Brazil is home to the world's largest urban rain forest. Woven among the city's bustling neighborhoods are soaring tree canopies, waterfalls, and miles of hiking trails. Rio de Janeiro, Brazil — My trek into Tijuca National Park started on a crowded tram that carries tourists up Corcovado Mountain, rising more than 2,000 feet above the city. The big draw here is the famous Christ Redeemer statue, one of Rio's biggest... [1891 chars]