Bernd 08/30/2020 (Sun) 23:55:26 No.39635 del
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>>39634

1, 2 - so called rostral columns, with ship-styled decoration.

4 - Saint Isaac cathedral - https://en.wikipedia.org/wiki/Saint_Isaac%27s_Cathedral

It was too late to visit cathedral, but we could walk up to roof (you can visit museum and cathedral's roof). Bought tickets literally in two minutes until ticket office closed.