If you’re a newcomer to D.C.—as in, you moved here after 2004—you may not have ever stepped foot in the Smithsonian’s second oldest building, though you’ve certainly seen it. The red brick Arts and Industries building, which sits between the Hirshhorn and the Smithsonian Castle, has been closed to the public for 15 years. In the early aughts, it was kind of falling apart: Everything leaked, and the SI Archives’ website sheepishly admits the HVAC was “on its last legs” when the decision was made to fully close it and move out all staff in 2006. The history it held—it was the first dedicated exhibition space SI ever had and served as an early site for what later became Air and Space, Natural History, and American History—made it worth saving, and a $55 million renovation finished in 2015 meant it’s been a special event space (so a lucky few have made it inside). Now, to celebrate the building’s 140th anniversary and the institution’s 175th, the Arts and Industries Building is reopening to the public with a fall exhibition, FUTURES. What kind of futures? “Futures Past,” for one, showing off tucked-away Smithsonian artifacts that don’t get much airtime, plus “Futures That Inspire,” “Futures That Unite,” and “Futures That Work.” Expect a lot of design-thinking optimism and impressive inventions. Or, as SI puts it: “Smell a molecule. Clean your clothes in a wetland. Meditate with an AI robot. Travel through space and time. Watch water being harvested from air. Become an emoji.” Become an emoji, people. November to January 2022 at the Arts and Industries Building. Free.