Found it. It is the Vatican Museums.
RE: (Original Work) The most beautiful staircase in the world (原创)世界上最漂亮的楼梯
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(Original Work) The most beautiful staircase in the world (原创)世界上最漂亮的楼梯
(Original Work) The most beautiful staircase in the world (原创)世界上最漂亮的楼梯
Found it. It is the Vatican Museums.