GUM is actually a common name of the main department store in many cities of the former Soviet Union. It is also known as State Department Store (in Russian: Государственный универсальный магазин and read as Gosudarstvennyi Universalnyi Magazin) during the Soviet times. Therefore, this department store which situated in Red Square area is called GUM or ГУМ. Although it is known as department store, GUM Moscow is currently considered as a shopping mall instead.
The trapezoidal building features a combination of elements of Russian medieval architecture and a steel framework and glass roof, a similar style to the great 19th-century railway stations of London. The glass-roofed design made the building unique. The whole interior and exterior of GUM Moscow is just lovely!