Pittsburgh is a city known for its three rivers, its many bridges and its eclectic architecture. But it lacks an iconic monument that's recognizable to the rest of the world, like Paris' Eiffel Tower or San Francisco's Golden Gate Bridge. Isn't it time this city had its own symbol? To see what fellow readers think Pittsburgh's symbol should be - from structures that already stand (the Cathedral of Learning) to concepts for a new structure (a huge, interactive Steelers symbol), see below: