East Sayan, river Kyngarga - Arshan, Buriatia - RUSSIAN FEDERATION (map it)
Still thinking if it was worth of swimming in ice-cold water of a funny named river.
Ach, as soon as we made 6.5 thousand km trip to this place - we would be sorry later if we didn't catch a flu in this river today :-)
Red Square is the heart of Russia. But the most interesting things happen under ground. You might listen to Vivaldi's Four Seasons somewhere in "Metro"(Moscow underground) passage and the sound and performance quality will be much better than that in Vilnius Filharmony. Amazing country