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Sparrow Hills
Ostankino Tower

If you have a fear of heights, prepare yourself mentally – the view is stunning but the glass floor section had me feeling a bit uneasy. I wish I had been more prepared for that moment.

I suggest going on a weekday if you can – it was much less crowded, and I got to enjoy the observation deck without bumping elbows with everyone.

I recommend buying your tickets online to skip the long lines at the ticket counter – it saved me lots of time! You don't want to waste your precious sightseeing hours standing around.
Cubiculum

My advice is to arrive 15 minutes early and chill out in the waiting area. It really helped us get into the right mindset, plus it gave us time to ask the staff about pro tips for solving the puzzles!
I suggest booking your escape room in advance, especially on weekends! We almost missed out because it was fully booked when we got there... A little planning can save you from disappointment