Tasoltan Dzakhov, Ossetian, participant in the Russian-Turkish war (1877-1878). The second photo shows him in his garden in Vladikavkaz, 1922. In 1891 Dzakhov took part in protests against the closure of the women's gymnasium, for which he was arrested and was in prison.

Mikhail Efremidi, a Greek from Pyatigorsk, 1910s. In 1914, Efremidi emigrated from Kars with his wife and three daughters to the North Caucasus. He settled in Pyatigorsk, where he owned several houses that were later confiscated by the Soviet authorities.

95% of the plastic waste that pollutes the world's oceans comes from these 10 rivers.

Russian Socialist Federative Soviet Republic, 1922. Source / Library of Congress

Kids on vacation in a sports camp. Dagestan ASSR, 1989. Third from left Buvaisar Saitiev, future three-time Olympic champion in freestyle wrestling, second from left Zaur Bataev, future European champion in freestyle wrestling.

The Border Between Georgia and Chechnya Photo / Ezz Gaber

Soviet advertising poster for foreign tourists, 1937. "From Shepetovka to Baku in 55 hours. The shortest, cheapest and most comfortable route between Iran (Persia) and Western Europe via the USSR"

Portrait of a child. Kislovodskaya stanitsa. Terek province, 1890s. Photo: Fyodor Gadaev (1858-1896)

Cossacks of Karabulakskaya stanitsa and deputies from Ingush villages. Terek province, June 24, 1907.

Noe Kipiani, director of the Museum of Georgia, showing German taxidermists the body of a dead Caspian tiger, 1921. The Caspian or Transcaucasian tiger is a now extinct subspecies of tiger that lived in the Caucasus, northern Iran and Central Asia.

A Dido woman with a child. The village of Asakh. Dagestan province, 1900. The Didois (also known as the Tsuntins or Tsezis) are one of the Dagestani peoples of the Avar-Andi-Tsez group.

A wedding in the Sunshev (Suyunchev) Balkar family. Terek province, 1900s.

Dmitry Mashirov, an Orthodox priest from North Ossetia alanianpriest / IG

May Day demonstration in Novorossiysk, 1930.