Tooba Mosque is known for its single vast dome, built without any interior pillars supporting the structure, which gives the prayer hall an unusually open, uninterrupted space. The white marble exterior and the scale of that dome make it one of the more visually striking mosques in Karachi's Defence area. It functions as an active neighbourhood mosque, so visits are best timed outside of prayer hours, but the architecture alone is worth the detour for anyone interested in modern mosque design.