For those of you that live in the USA or travel here, Washington DC is a great place to visit. When you visit the National Mall (it's a National Park area), you'll find tributes to famous Americans and wars Americans were involved in.
I took this picture of the Three Soldiers in May, 2007. The Vietnam Memorial wall is just off in the distance to the left. Memorials are meant to cause a person to reflect and I think the designer accomplished his goal.