in "heart of darkness" joseph conrad writes of his alter ego -- when i was a little chap, i had a passion maps. at that time there were many blank spaces on earth. but there was one yet, the biggest, the most blank, that i had a hankering after. this then is the congo. the size of all western europe combined. it should be africa's wealthiest nation. the people forget, or never even knew, that the 20th century's first holocaust happened here when belgium's king leopold managed to bamboozle giving him personal title to the congo. leopold's agents of whom the mythical kurtz was one, raided, slaughtered, mutilated and pressed into forced labor much of the population, in a bloodthirsty quest for first ivory and then rubber. when independence finally came, the belgians trashed what they could, and left behind a completely unprepared tribally divided and largely ungovernable land mass, filled with stuff that everybody in the world wanted. and things pretty much went downhill from there. ♪ >>> but this story begins with the truck stop. in rwanda. stocking up in rwanda. my expectations for food in

>> well, i'm obsessed with the book "heart of darkness" by joseph conrad and the king leopold belgiumdescribed in that book. it's a subject that i've long been obsessed with. so few people know what king leopold, one the king of belgium did to the congo, what he was able to do. basically make it his personal treasure chest and slaughter the population by the millions. this is an era of history that few people are aware of. it's a story i've wanted to tell for a long time. >> this weekend you visit peru with a particular quest in mind. tell us about that. >> much more lighthearted. i got into a high-end chocolate venture last year with my friend eric. i asked myself, well, we all like chocolate, we're obsessed with it, in fact. most of us in the western world. where does it come from? who makes it? who gets paid? you know, where does the money go on your average bar of chocolate? where does the money go on a high end bar of chocolate? >> i went to a remote area to a valley where they grow wild, very rare variety of it and answer those questions. >> a good season for you and for cnn. i'