"参观故宫" (cānguān gùgōng) 在英语中可以说作 "visit the Forbidden City".
"Forbidden City" 这个词来源于清朝时期，当时皇帝居住的宫殿被称为 "紫禁城" (zǐjìnchéng)，意为 "禁止入内的城市"。英文翻译成 "Forbidden City"。
例句:
I'm going to visit the Forbidden City next week. (我下周要去参观故宫。)
Have you ever been to the Forbidden City? (你去过故宫吗？)
The Forbidden City is a must-see attraction in Beijing. (故宫是北京必看的景点。)