This slick, ultramodern exhibition space also houses Rio's Telecommunications Museum. The museum itself delivers a unique multimedia adventure—lots of monitors, blinking lights, and media artifacts. After you've been oriented in the use of the MP3 headsets, a light- and mirror-filled airlock-like room awaits. The sights in this tiny exhibit space will likely mesmerize you, and if you don't speak Portuguese, the English guide will explain what you can't figure out from the visual cues. The other floors of the Oi Futuro building house cultural spaces devoted to theater performances, film screenings, and art exhibits. There's also a café whose rooftop terrace is a pleasant place to enjoy an iced cappuccino on a balmy day.