Give your senses a jolt at Sky Costanera Observatory, on the 61st and 62nd floors of the Costanera Center. A 50-second elevator ride takes you almost 1,000 feet into the sky for a thrilling 360-degree view of the city, population five million, with the snowcapped Andes as a backdrop. Guides are on hand to point out cityscape highlights. Not for scaredy-cats. Note: In case of rain, return first thing the following day, the best time to visit for the clearest view.