Most expensive museum admission?

I am passing through Asheville, NC and considered stopping by Biltmore but $90 a person is just not in the budget right now. I may try and go again in the winter when tickets are not quite so expensive. I am sure the upkeep is tremendous, and it does get you access to the house and grounds, wine tasting, and parking, but still! It did get me thinking if I have ever experienced a museum with admission that pricy. What is the highest admission you have seen for a museum? Would it be worth it for you?