I have never been invited to visit another dimension. I know of only one person who may have. Bigfoot likely can take both people and inanimate objects into another dimension. That would be how the little people take their clothes with them, as they move between dimensions.
Of course the NSA reads this website, as they do all bigfoot related websites. They also know that the cover of their supermole, has been blown. And so does their supermole. He's been at his supermole job for a long time, and has met with every significant bigfoot researcher in the United States. He has camped on Mary Green's property and is good friends with her. Her bigfoot don't trust him though. He has gone to every significant research site that he could get into. He is good friends with the top bigfoot contactee in the U.S. and the top bigfoot author. So he has achieved great success for the NSA. Because the NSA has the inside dope on every major researcher and contactee in the U.S. And he is still in the loop with most of the major researchers, who have a clue. Once any new irrefutable evidence information enters that researcher loop, the NSA will know about it within hours, if not minutes. And then it will be gone.