A number of mine have already been mentioned, but I'd like to add:
1) Public disclosure of what lies under the Sphinx's paws.
2) Access to what is stored in the basement of the Smithsonian (you can also toss in hidden Vatican archives here, too).
3) That my mother will realize that her compulsive hoarding is a problem and will willingly seek help for it and then clear out all of that stuff so
I won't have to do it!!!!!!