Boston's Ann Beha Architects' refined and airy touches in a recent $21 million expansion brighten Manchester's splendid Currier Museum of Art. The new natural-light-filled Winter Garden — complete with stone columns and mosaics from a former entrance — is the museum's hub. Modernist European and American works by Matisse, Picasso, and O'Keeffe, along with regional artists, grace the roomy institution, which continues to mature from its Beaux-Arts building beginning. Currier Museum of Art, 150 Ash Street, Manchester, 603-669-6144, currier.org.