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 (15[1])in the south 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, (15[1])formerly contained a room dubbed an (*) “eighth wonder” originally sculpted by Andreas Schlüter. That room, likely destroyed in a Königsberg (10[2]-5[1])air raid, (10[1])was made out of amber (10[1])panels for a palace near this city. The Jordan Staircase is found in another residence (10[1])in this city now converted into the State Hermitage Museum. For 10 points, name this Russian city home to the Catherine and Winter Palace. (10[1]) ■END■