Yes... I have heard of it.
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No, Sandler is not part of a mythical, largely made-up, although loosely based in reality former organization from south central Europe. The Illuminati does not exist, so it would be difficult for anyone to be "part" of it.
No, no, no, Usher didn't knock anyone up.
I don't think there is a headquarters...but I'm guessing the one in Florida would be the 'main' Disney Land.
You can get Harry Potter wands at Universal Studios Islands of Adventure. That is where the Wizarding World of Harry Potter is located.
No. Cary Grant explicitly denied being gay, was quite amused that anyone would think so, and was DEFINITELY capable of sexual interaction with women (just ask his wives). All supposed evidence that Cary Grant was gay is based on rumors and innuendo about his relationship with Randolph Scott, but never with anyone else.