There are many walls in Belfast which physically separate Protestant neighborhoods from Catholic ones. Some are fences that you can see through, while others are made of bricks and steel. Many have clearly been reinforced over time: a cinderblock wall topped with corrugated iron, then topped with razor wire, stretching up towards the sky. Many of the walls in Northern Ireland went up in the 1970s and ‘80s at the height of what’s become known as “The Troubles.” Decades later, almost all of the walls remain standing. They cut across communities like monuments to the conflict, etched into the physical landscape. Taking them down isn’t going to be easy.