Ricky Gervais and Stephen Merchant's comedy punch bag Karl Pilkington is each week sent to one of the seven wonders of the world. Hilarity enshews (for the most part).
This week Karl is sent to China to check out the Great Wall, but first he wanders around a Chinese market where he gets wierded out by locals eating insects while he munches away on a bag of Monster Munch. He is less than impressed by the Great Wall when he finds out it was refurbished in the 50's and again in the 80's which leads him to the conclusion that it's no longer a great wall, just a wall.
Gervais and Merchant appear briefly at the start when they send Karl off (and rip the piss) and as disembodied voices on the phone giving Karl things to do, but other than that it's just Karl being Pilkington and very funny it is too; on the whole. Occasionally he doesn't have anything utterly ludicrous to say and these, admittedly short, periods come off as bad travelogue with someone who can't teach you anything. But generally this is consistently as funny as you'd hope.