It's an enormous inverted salad bowl. Or maybe it's headquarters of the Justice League of America, where superheroes Aquaman, Superman, and Wonder Woman gather to hatch world-saving strategies. Actually the distinctive building that distracted you so much you nearly veered off the road is the Aventura Government Center. Dreamed up by Michael A. Schiff & Associates and Arquitectonica, the striking contemporary structure swathed in glass and Indiana limestone features a spectacular sloped rotunda, where elected officials meet to make city policy. Since it opened in May 2001, the 72,000-square-foot marvel, housing all government operations (including the police department) has become what its creators had hoped: a one-stop shop for dealing with city business. And quite the looker as well.