I have no personal knowledge of any of these except for the thumbs-down--which I second--on the Hollywood Walk of Fame.
See also the probably more controversial "The 16 Most Disappointing Places To Visit On Earth".
A cool idea, well-executed.
Don't--I repeat, don't--make any jokes at all about bombs: "A Doctor Made A Bomb Joke In An Airport And Was Fined $90,000".
I'll pass, thanks, but those of you with wanderlust may find this interesting.