I've been to something like 155 countries alone, except for my bicycle. This includes 48 on Africa. I visited/revisited about half of those with my wife. (We we're extraordinarily compatible.). Forty-plus years ago, travelling in Africa or behind the Iron Curtain was difficult solo. Today, almost any place is easy alone. Now I've no wife and cannot imagine having such a compatible companion. (Nor many people interested in Chad, Niger, Yemen, Somalia.) So solo it is.