Russian Orthodox churches have distinct and recognizable style among church architectures. As early as the fifth century, church plans varied from in every part of the world. Basilicas for example were long rectangular structures divided into aisles by columns with a semi-cylindrical apse at one end of the nave. The most dramatic feature of the church are domes. Russian domes have onion shape. The church in orthodox religion is a symbol of the Universe and the dome as such stands for the open heavens that transfigures the world, but the spiritual aspect is one, and physical is another, the dome enables to magnify the voice and makes it more spiritual and pronounced. The colors of the domes are highly variable and carry theological significance and are intended to point their viewers toward God. The amount of domes vary as well, some have three representing the Trinity: Father, Son and Holy Spirit, others five, representing Jesus, Matthew, Mark, Luke and John. Some of the most spectacular orthodox churches can be found in the Golden Ring, the ancient towns that played a significant role in the formation of the Russian Orthodox Church. The towns have been called “open air museums” and feature unique monuments of Russian architecture of the 12th–18th centuries.