字幕表 動画を再生する 英語字幕をプリント China's amazing Forbidden City. "The largest palace complex built at any time in history." An engineering wonder... "How did they build?" ...made almost entirely of wood. "It's a very sophisticated piece of woodworking." And in one of the most earthquake-prone places in the world... "Look at how solid it is." ...how has it survived for more than 600 years? NOVA reveals the Secrets of the Forbidden City.