Worcester Memorial Auditorium (also known simply as "the Aud") is a multi-purpose arena located at Lincoln Square in Worcester, Massachusetts. It was built in 1933 to honor the sacrifices of Worcester citizens during times of war. The building includes a multi-purpose auditorium originally designed to seat 3,500-4,500 people, a smaller entertainment space known as the Little Theater designed to seat 675, and the Shrine of the Immortal, a war memorial with murals by renowned artist Leon Kroll commemorating the 355 soldiers and nurses from Worcester who fell during World War I. The Aud was added to the National Register of Historic Places in 1980 as part of the Institutional District. In 2009, Preservation Massachusetts included Lincoln Square on its "Most Endangered Historic Resources" list