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 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 (10[1])wonder” originally sculpted by (10[1])Andreas Schlüter. That room, likely destroyed in a Königsberg (10[1])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. For 10 points, name this Russian city home to the Catherine and Winter Palace. ■END■