A genuinely unusual building. Instead of the colonial pastiche or neo-Gothic spires of most Colombian cathedrals, the Catedral de la Inmaculada Concepción presents a curving concrete sail pierced by stained glass. From outside it looks like a piece of brutalist sculpture; inside, the high white interior is bathed in coloured light.
Worth ten minutes if you're already on the plaza. Mass is held throughout the day and the building stays open for visitors between services.