Menno visits the Peace Walls in Belfast, Northern Ireland. Although there has been peace for over 15 years between the Protestant and Catholic population, Menno finds out there are still tensions between the two groups.
In the Western Sahara there is a 2700 kilometer sand wall to separate the Sahrawi population from the Moroccan population. Menno travels to both sides of this wall and discovers a 40-year-old conflict.
Travelling around the Israeli West Bank barrier, Menno discovers this wall made life for the Palestinian people a lot worse while the lives of Israelis and Jewish colonists improved.