What would it look like to reimagine the world's greatest monuments and structures from throughout history? How would we go about it? What would it cost? What role do politics, science, and design play in their creation? And what elements can we take with us from past builds to ensure we are best representing these important, historically significant structures and cities today. In an all-new season of IF WE BUILT IT TODAY, experts re-imagine the world's most impressive building projects to reveal how much time, labor, and investment would be necessary to build the most astounding structures in today's world.