Look for the “Whirligig,” a 55-foot wind-powered sculpture at the front of this curvaceous building. Step inside, and you’ll be entranced from the moment you set your eyes on Emery Blagdon’s “Healing Machines” mobile hanging down three stories. Visionary art is created by people who lack artistic training but feel compelled to draw, paint, or build a ship with matchsticks. Everything here is fascinating; some of it can be quite troubling. And the artists’ stories are as interesting as their art. Some of the work is too strong for children (the museum will alert you about that); other exhibits are a joy that kids will love. The new Jim Rouse Visionary Center, built in a converted whiskey warehouse, expands the space and will feature the social visionary in future exhibitions. On the first Thursday of the month from June through August, the neighbors gather in Federal Hill Park to watch a free movie screened on the side of the museum’s building.