This is a bit of a hidden secret of São Paulo, but it's definitely worth doing, and do so early on…read morein your visit. You are first greeted by the wonderful Art Deco chandelier in the atrium, which is a pretty impressive space in itself. But that's not all. Head over to the reception desk and you will discover that for a modest fee, the bank allows small groups to ascend to their rooftop viewing tower. It's the tallest building in the city centre and it provides a fantastic panorama of the city. The (escorted) ascent is made via two elevators and a final couple of flights of stairs. At the top there is a small room containing some exhibits about the building of the bank and a few museum pieces from their past, all of which are interesting to browse whilst you wait for your chance to make the final ascent to the small circular viewing platform. The view is nothing short of breathtaking. It's hard to appreciate how huge this city is until you see it from this height (it's the third largest city in the world by population). Endless cityscape stretches away in all directions. If you're very lucky and the smog isn't too thick, you might catch a hazy glimpse of mountains on the horizon or the fiery burst of refinery flares in the far distance (at night it must look like the opening scene in Blade Runner). There are good views of the nearby Mosterio São Bento (also worth a visit) and the main Cathedral. If I knew the city better I could probably have picked out a few more landmarks, but I had only been there a couple of days at the time. On your way out be sure to check out the enormous antique safe in the foyer, which is a wonderfully ornate piece of work.