Drones recreated a never-built bell tower for a blue and white cathedral in this city, whose interior was completed in 1835. A park near this city contained an early roller coaster at the Riding Mountain pavilion. A residence in the south (15[1])of that park near this city previously housed hanging gardens and features gilded rooms called the Golden Enfilade. That palace near this city, redesigned by Bartolomeo Rastrelli, formerly contained a room dubbed an (*) “eighth wonder” originally sculpted by Andreas Schlüter. (10[1])That room, likely destroyed in a Königsberg air raid, was made out of amber panels for a palace near this city. The Jordan Staircase is found in another residence in this city now converted into the State Hermitage Museum. (10[1]) (10[1])For 10 points, name this Russian city home to the Catherine and Winter Palace. ■END■