Ancient Sintashta mogila kurgan funary complex (52.4861914, 60.1882577) circa 2750 BCE. This kurgan complex is just north of the earliest known fortified metallurgical settlement built by the Yamnaya culture on the east bank of the river. Famous for the discover of very early warrior chariot. See Chapter 15 of The Horse, The Wheel, and Language by David W. Anthony, 2007, Princeton UP. Original work by Gening, Zdanoovish and Genning, 1992 in their book in Russian "Sintashta".