
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.

Menno travels to the border between Mexico and the United States where he investigates the steel wall that separate the two countries.

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.