Our very own John Hessler was featured in today’s Washington Post talking about some of the mysteries behind one of the grand-daddies of all maps, the 1507 Martin Waldseemüller World Map, the document that named “America” and one of the Library’s toppest of the top treasures. (OK, we don’t categorize the treasures quite that way, but a $10 million map would be among the “toppest” in my book.)

John will be taking questions during an online chat tomorrow (Nov. 18, 2008) at the Post’s Web site starting at 11 a.m. EST. You can read the chat here after it gets underway or submit your questions in advance.