With the largest collection of Russian art in the world, this museum is a must-see for anyone traveling through Moscow. Merchant Pavel Tretyakov started collecting art in 1956 at his house in Moscow's Zamoskvorechye district. After his death, the building was renovated, a new fairy-tale-like arched facade added, and the family home was turned into a museum in 1898. Eventually the building had to be extended to accommodate the growing collection. Be prepared to spend several hours with such masterpieces as the medieval icons by the great Andrei Rublev (c. 1360–1430), the rich pastel portraits of Karl Bryullev (1799–1852), and the seascapes of Ivan Aivazovsky (1817–1900). Be sure to also visit the 20th-century Tretyakov collection, which is in the Krymsky val area and included with admission here. This collections features renowned modern Russian masterpieces by Wassily Kandinsky, Marc Chagall, Natalia Goncharova, Social Realists of the 1960s, underground artists of the waning years of the Soviet Union, and artists from the 1990s.