Russia
This cathedral rarely gets a mention, but because it is often overlooked it is fantastic to visit. You don't have to jostle with other tourists and its cool blue walls look absolutely fantastic in the snow. It's a few minutes south of the Yusupov Palace.
Prospekt Rimskogo-Korsakova or just follow the Griboedova Canal west from Nevsky Prospekt for about 15 minutes
If you're in St. Petersburg in the summer then don't miss the chance to visit Peterhof. The fountains are spectacular but unfortunately do not operate in the winter. The easiest way to get there is by hydrofoil which leaves from behind the Hermitage. It takes 30 minutes to get there.
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