Christy Walton, the richest woman in the world, has put her 2.45-acre Wyoming estate on the market for $12.5M. Yesterday Forbes named her as No. 6 on its Forbes 400, a rank she held last year, and calibrated her fortune—which she inherited from her late husband, a son of Wal-Mart Stores Inc. founder Sam Walton—at $35.4B. To summarize: even if the estate commands its asking price, Walton probably won’t bat an eyelash. In fact, after her husband’s 2005 death, Walton went so far as to donate—yes, donate—the stately 1896 Victorian where she had raised her family, in National City, Calif.

About this Teton Village property: it’s “an architectural masterpiece,” according to the brokerabble, with 200-year-old reclaimed-oak floors, Albertini windows, cathedral ceilings, a two-bedroom, turn-of-the-century guest cabin, and direct access to Jackson Hole Mountain Resort.