Peter and Paul Fortress sat on an island where the Peter and Paul Cathedral was the resting place of the Tzars and royal members, including Peter the Great, Elizabeth, Catherine the Great, as well as the last Tzar, Nicholas III. One could tell the entire story from Peter the Great's time to Nicholas III just within the cathedral. It's definitely a very sacred place in the Russians' heart.
The Sapsan brought us back to Moscow in approximately 4 hours! Well, compared with the time we took to arrive, I think Sapsan would be a great choice to save us from all the agony. BTW, we nearly board the wrong train. Haha... Thanks to someone alerted us that ours should be the following train.
Of course, we once again met the peak hour jam. Haiz... basically, the traffic was chaotic!