The Royal Library (Danish: Det Kongelige Bibliotek) is not just the main national library of Denmark, but also one of the largest libraries in Scandinavia, located in the heart of Copenhagen. It is officially named the Royal Library, the National Library, and the Copenhagen University Library, reflecting its multifaceted role. Today, the library's collections are housed in several buildings, including three Copenhagen University campuses and the famous main building on Slotsholmen island.

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The main Royal Library complex is a stunning blend of past and present. The historic building, constructed in 1906, is an architectural gem inspired by Charlemagne's Palace Chapel in Aachen. Next to it, serving as a bridge between eras, is a modern marvel — the building known as the "Black Diamond" (Den Sorte Diamant), which opened its doors in 1999. This impressive structure is not only a book repository but also an important cultural center.
The "Black Diamond" instantly became one of Copenhagen's signatures and a prime example of modern Danish architecture. It got its name from its striking facade of polished black granite and tinted glass, the facets of which shimmer in the sun, reflecting the canal water. The building's irregular shape, with walls tilting in different directions, gives it a futuristic and dynamic look. Inside the Black Diamond, you'll find not only reading rooms but also a concert hall, exhibition spaces, a cafe, and a bookstore, making it a popular spot for meetings and cultural leisure.