If you look at a map of Rio, you’ll see a giant green spot: the Tijuca rain forest, one of the largest urban jungles in the world. This park includes more than 9,900 acres where visitors climb rocks, hang-glide, bike, or even take a drive (this last the easiest and fastest). The foliage—typical of Brazil’s huge rain forest, the Mata Atlântica—was nearly wiped out by coffee production in the 17th century. Thankfully, in the 19th century Brazil’s Emperor Pedro II encouraged reforestation here, and this national park displays the lush results.