Sochi is a Russian city on the Black Sea, a popular beach resort. In 2014, the Winter Olympic Games were held here. One of the main attractions of the city is the arboretum known for its palm trees. In addition, the city is famous for the neoclassical buildings of the XX century, such as the Winter Theater with a colonnade. At the foot of the Caucasus Mountains is a national park - a forest area of 1937 square kilometers. In 70 kilometers from the sea the famous ski resort Krasnaya Polyana is located. The population of the city is constantly increasing and in 2017 it was almost 400 000 people.