It was humbling, though the worst by far was Cambodia. We visited killing fields just outside of Phnom Penh where victims tortured for months in the S-21 security facility (a converted high-school) were finally executed in shallow graves. As you walk around, it's important to watch where you step as teeth, fragments of bone, and blindfolds/ bindings are brought to the surface during the intense rainy seasons. Weirdly, it's also one of the most beautiful places on Earth I've ever visited, filled with flowering trees and thousands of butterflies.