Forgotten but not gone

In 2001, the National Trust for Historic Preservation placed the old single-screen movie theater at the top of its Most Endangered Places. These architectural gems from the 1920s and ’30s were in almost every city and town during Hollywood’s golden age. Many were originally built for vaudeville shows, then started showing movies when talkies replaced live performances. Suburbs and multiplexes brought the wrecking ball to many of them, which is the subject of “The Art of the Movie Theater: Photographs by Stefanie Klavens.’’ Today from 10 a.m.- 4:30 p.m. (through May 16). Free. The National Heritage Museum, 33 Marrett Road, Lexington. 781-861-6559. www.nationalheritagemuseum.org