You'll want to browse the collections at Museum of Soviet Arcade Machines, Rizhskaya Railway Museum, and Central Armed Forces Museum. Some landmarks that you won't want to miss include Ostankino Palace, Central Academic Theatre of the Russian Army, and Arch of the Main Entrance of VDNH. You can watch performances at Satirikon Theatre, Helikon-Opera, and Moscow State Historical and Ethnographic Theater if you're interested in local theater.