The first order of construction was primarily designed in a Soviet version of Art Deco, with some remains of avant-garde forms. Parts of the second and third orders, which opened in 1938 and 1943, are like this as well. Stations built from that point until the end of the 1950s can be described as Neoclassical with Empire-style motifs , usually for post-war projects treated as war memorials. These make up a little less than a quarter of the total stations in the system, but they are the most visited ones in the center and main line interchanges. Only 44 of total 214 stations are listed as historical monuments, including a few from the ‘50s and nothing since.