where is it located?
Russia
Onion dome
Russian 
what is referred as onion dome? Is referred to a dome whose shape resembles an onion and is usually associated with Russian architectural style.
wiki:20243262
Onion dome [SEP] Introduction
An onion dome (, "lúkovichnaya glavá"; compare , "luk", "onion") is a dome whose shape resembles an onion and is usually associated with Russian architectural style. Such domes are often larger in diameter than the tholobate upon which they sit, and their height usually exceeds their width. These bulbous structures taper smoothly to a point. It is a typical feature of churches belonging to Russian Orthodox church. Occasionally, there are similar buildings in European countries like in Germany in Bavaria, (German: "Zwiebelturm" (literally "onion tower") in Austria, the Czech Republic, Hungary, northeastern Italy, in other Eastern European countries and in Oriental regions like Mughal India, the Middle East and Central Asia.