Kicking off Ask This Old House's 25th season, Mark McCullough travels to New Mexico to learn the art of adobe, from mixing and forming bricks to repairing a cracked earthen floor. Tom Silva shows Kevin O'Connor an easy trick for cutting miters on imperfect corners. Then, Jenn Nawada revisits a garden she transformed on the show over 10 years ago to see it fully grown in and flourishing.