The United States spends just 0.93 percent ($112.9B) of its gross domestic product on infrastructure, and the Urban Land Institute estimates that it would take $1.6 trillion to make the much needed upgrades required to bring it up to par.

In its February issue, Architect magazine asks architects, engineers, planners, and others how best to spend that hypothetical $1.6 trillion.

Aside from opinions from well-known names like Ron Paul, Richard Florida and James Hoffa, there are ideas from lesser-known - but highly qualified - people that range from the practical to the whimsical to pure fantasy.

I wonder what they would say about our Brent Spence Bridge?