Republic Square is the central town square in Yerevan, the capital of Armenia. It consists of two sections: an oval roundabout and a trapezoid-shaped section which contains a pool with musical fountains. The square is surrounded by five major buildings built in pink and yellow tuff in the neoclassical style with extensive use of Armenian motifs. This architectural ensemble includes the Government House, the History Museum and the National Gallery, Armenia Marriott Hotel and two buildings that formerly housed the ministries of Foreign Affairs and Transport and Communications. The square was originally designed by Alexander Tamanian in 1924. The construction of most of the buildings was completed by the 1950s; the last building—the National Gallery—was completed in 1977.

Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous. Tuff composed of sandy volcanic material can be referred to as volcanic sandstone.