From the TDN Look Take the man-made structures from most cities and what's left is a meadow and, maybe, a pretty confluence of rivers. Take them from Rio de Janeiro, and you have one of the most picturesque places on Earth. Soaring granite peaks...verdant jungles...wide, pristine beaches and an eponymous ocean current that keeps the turquoise coastal waters warm year-round. Now add to that landscape an ethnically diverse population of 7.5 million people who share a love of beach culture and good times, and you have one of the most...