The Historical Galleries are divided into 12 sections from ancient to modern times. I build dioramas in all scales, but the most common sizes are in 1/72nd, 1/35th, and 120mm (1/16th). If you're not familiar with these scales, you'll find each diorama has at least one picture which where I inserted a quarter, which is one inch diameter. This will give you an idea of size of each piece.