Head to Massachusetts Avenue and Ninth Street NW in Mount Vernon Square to tour the beautifully renovated 116-year-old Carnegie Library and the Historical Society of Washington’s three galleries showcasing D.C. history exhibits, and, yes, to check out Apple’s brand-new flagship store, scheduled to debut in late 2018. If you are in D.C. prior to that store’s opening, you can always visit the one in Georgetown, to hang out and fool around on the floor samples, study the merchandise, and get your questions answered by techy geeks roaming the room.