The Wonders of the World, though setting the destinations for each of Karl's visits, are not the main point of An Idiot Abroad. Karl does see them, even being forced to travel the entire Great Wall of China, in order to get the full experience. But the real draw is the people around the Wonder, and that's what Karl spends most of every episode dealing with. He has to take in new customs, and taste new foods. Generally, this does not go all that well, much to the enjoyment of viewers.
It is a little bit odd that Karl goes the journey alone, with Ricky and Stephen only checking in via phone. However, that also makes Karl less likely to deal with the situation well, not even having his friends to turn to. The other two are a presence on the series, but the focus is Karl's interactions with locals, with makes for a very entertaining time.
The special features on An Idiot Abroad are almost nonexistent. The Preview Show that aired on television is included, as are deleted scenes and a photo gallery. And that's it. Considering the final episode of the season mainly consists of Stephen and Ricky speaking to Karl about the whole experiment, a making of documentary would seem unnecessary. And it's hard to think of any specific bonus that should have been included. But it's still a little disappointing there isn't a little bit extra for the fans who really enjoy the TV series.