Cathedral of Brasília and it's bell tower, from a trip a little while ago. You wouldn't guess this was a church if you hadn't been told so. (Or you might, there's a huge cross at the top of it and all, but you'd have to admit it's at least an /unconventional/ one)
Conveniently located just outside Brasília's central bus station, it's only a quick walk away from the National Congress and most other buildings housing the bulk of Brasil's federal administration. Actually, the whole region for the Plano Piloto is tiny, I really wasn't expecting that. Frustratingly unwalkable, too.
I've arrived just slightly too late for their visiting hours, but I did get to take a slight glance within: the dimly-filtered light peeking through the stained glass roof onto the circular nave sunk into the ground, with the angel sculptures floating right above the main altar does make for a spectacularly gloomy atmosphere.