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ancient ruins architecture history civilization mystery exploration discovery adventure spectacle magnificent grand 震撼 叹为观止 unbelievable 匪夷所思 alien prehistoric civilization lost world mysterious ancient civilization ancient ruins ancient architecture historical traces the rise and fall of civilization 沧海桑田 the passage of time the vicissitudes of life the change of stars things are different the world is无常 人生苦短 天地永恒