Very interesting topic:
I always felt that three places must have some type of activity
1)The Winter palace
2) Tsarskoe Selo, Catherine palace and the Alexander
3) the Mikhailovsky castle
Not to be a buzz kill but I always find it rather amusing that 95% of ghost stories are reported by people living in older homes, generally decades older than the current residents. How is it ghosts sightings are so prevalent in colonial or Victorian era homes, but if someone dies in a stylish modern flat in New York City you rarely hear anything? lol. Funny how ghosts seem to want to haunt homes that are naturally creaky, and drafty to begin with...
Also I find it interesting about the reports of what they're wearing. If you were buried in a suit or gown why is it that ghosts are usually wearing something else when seen? And, to that point, why are ghosts wearing clothes at all? When you die and, as we all probably hope for, your soul exits the body leaving your body behind to return to the earth. But the clothes you were dressed in don't also die...nor as lifeless inanimate objects do they possess a soul of their own to be taken with them into the afterlife.
I guess I feel like, for more (or perhaps
any) of these stories to be true we should see a lot more hauntings in newer buildings and by naked ghosts, lol :-)