Only on the "CBS This Morning" podcast, "Architectural Digest" editor in chief Amy Astley tells CBS News' Reena Ninan about the "daunting" task of delving into the magazine's 100-year archive in order to publish the new book, "Architectural Digest at 100: A Century of Style." The book celebrates the best celebrity homes and exceptional work from the top designers and architects that have been featured in the magazine. Astley explains how "AD" has adapted to the digital age and reached a wider audience through Instagram and video home tours on YouTube. Plus, she discusses her career and how stints at "House and Garden" and "Vogue" magazines prepared her to take the helm at "Architectural Digest."