The most important historical place in my country , which I visited , is Moscow Kremlin. This is an architectural ensemble of the imperiors palace in past and a gouverment building nowadays. It located in the center of Moscow . It is the most important historical place in Russia , because it was the state of the tsars , imperior , soviet leaders . But that is not only historical , because it is in use of gouverment and president . Moscow Kremlin is actually the capital and heart of the Russia.
Moscow Kremlin include Red Square , St.Basils Cathedral , mausoleum of Lenin , Cremlin towers , and many other atractions. We can easilly call that as "Russian collection " . That could pass us throw the time and show all the history. Moreover, there is a few museums, which do these duty well. So , all the tourists of Moscow always visit the Kremlin.
I really recommend you to visit because , at first , I really like these place , at the second , because it the Russian history , feelings and smells which is collected in one place.