Washington D.C.'s Street Plan Was Designed to Confuse Invaders
Pierre Charles L'Enfant designed Washington D.C.'s famous diagonal avenues cutting across the standard grid specifically so that invaders would get lost navigating the city. The design creates dozens of complex intersections and traffic circles — including the famous Dupont Circle and Logan Circle — that disorient newcomers to this day. L'Enfant also strategically positioned key government buildings on high ground for defensive purposes.