The Carillion is square tower with 50 bells. Each Sunday night the bells are used with a concert from late May though September. My visit was on a Sunday afternoon, no concert, but the bells were performing some music. One was the U.S. National Anthem. The Carillion is located just 100 yards from the Marine Corps Iwo Jima Memorial. I have been told the bells are very impressive. Possibly during my next trip to Arlington,I will stop for a concert.