Lars Brownworth: The city of walls: Constantinople

The world owes much of its cultural legacy to Constantinople's walls. When Constantinople was under siege by neighboring enemies, the Roman city's elaborate system of moats, outer walls, and inner walls stood tall. Surviving numerous fire attacks, the walls were eventually brought down by more modern tools of warfare, but, thankfully, classical culture survived. [Directed by Henrik Axlund & Petri Ruikka, narrated by Lars Brownworth].