Budapest's National Széchényi Library is the largest public library in Hungary and one of the most important cultural institutions in the country. Founded in 1802, the library houses a vast collection of books, manuscripts, and other materials related to Hungarian culture and history
From Wikipedia
The National Széchényi Library (OSZK) is a library in Budapest, Hungary, located in Buda Castle. It is one of the two Hungarian national libraries, the other being University of Debrecen Library.