Visitors listen to the guide's introduction in the Spanish National Library in Madrid, Spain, on April 15, 2018. The Spanish National Library had its once-a-year public open day on Sunday, which allowed the public to discover its secrets by visiting various parts of the library. (Xinhua/Guo Qiuda)
Spanish National Library has its once-a-year public open day in Madrid
Source: Xinhua| 2018-04-16 09:54:10|Editor: Lifang
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