Short answers, pulled from the story.
The Kostyonki, Borshchyovo archaeological site sits within Khokholsky District in Voronezh Oblast, Russia. It lies approximately 25 kilometers south of the city of Voronezh on the western bank of the Don River.
Cornelis de Bruijn stood on the western bank of the Don River in 1703 and found many elephant teeth while wondering how they arrived there. The Emperor Peter I told him that Alexander the Great once passed this river near a small town called Kostenka.
I. S. Polyakov excavated Kostenki-1 starting in 1879 between the years 1845 and 1887. Further searches for stone tools occurred from 1881 through 1915 across the region before systematic work began in the 1920s under P.P. Efimenko who led teams until 1938.
Some of the earliest directly dated human remains from this site measure 32,600 plus or minus 1,100 radiocarbon years. They consist of a tibia and a fibula with traits classifying them as European early modern humans.
A 25,000-year-old bone circle structure containing at least 60 mammoths appeared during a 2020 discovery at Kostyonki-12 known as Volkovska. This circular formation measures over 11 meters in diameter.