Old Sacramento State Historic Park is a cluster of noteworthy, early Gold Rush commercial structures. Historic buildings include the 1849 Eagle Theater; the 1853 B. F. Hastings Building, once home to the California Supreme Court; and the 1855 Big Four Building. Old Sacramento's historical significance comes from it being the western terminus of the Pony Express postal system, the first transcontinental railroad, and the transcontinental telegraph. With over 50 historic buildings, Old Sacramento has more buildings of historic value in its 28 acres than any area of similar size in the West.

A second website for the park can be found here.

The park offers exhibits, tours, educational programs, living history programs and events, and other educational and recreational events.

Built in 1885, the original Opera House burned down in the 1892 fire that destroyed much of downtown Woodland. It was rebuilt on the same site, using some of the remaining foundations and bricks from the walls, reopening in 1896. Today, the interior of the Opera House has been painstakingly restored to the grandeur it enjoyed at the turn if the century. Careful attention was paid to reproduction of the wallpaper friezes, paint colors, and carpeting. The main floor carpet was manufactured in England and shipped to the Opera House for installation. Comfortable main floor theater seating was built on the East Coast for installation and the historic pew-like benches in the balcony area were repaired or carefully replaced.

A second, individual website for the Opera House can be found here.

The park offers tours and year-round performances, productions, classes, and workshops.

THSA is the only organization in the U.S. which exclusively records and preserves the rich architectural, cultural and social history of America's theatres. Through its collections and publications, THSA makes available information on more than 15,000 theatres, primarily in the United States, and encourages further research in these areas. The Society also operates the American Theatre Architecture Archives and the American Movie Palace Museum. The Archives contain an extensive collection of photographs, slides, negatives, books, blueprints, clippings, videos, printed programs, and other material on historic theatres, primarily in the U.S. The Museum features exhibits of photographs, artworks, antiques, artifacts, and other memorabilia relating primarily to the "golden age of the movie palace."

The society offers annual tours; the archives offer research access; and the museum offers exhibits and tours.