St. Basil's Cathedral, Red Square, Moscow, 1992 or 1993.
Red Square is one of the most impressive public spaces I've ever been to. In terms of important historic events per square foot, it packs in more than anywhere else.
BTW, the "red" in Red Square has nothing to do with Communism. It's actually a misnomer. In Russian, the name is Krasnaya Ploschod. "Ploschod" means public space. The word "krasny" means both red and beautiful. Really, its "beautiful square", not "red square". There's a reflecting ambiguity in English, where the word "square" can mean two entirely different things.
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