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Oktogon is an urban passageway in central Zagreb, Croatia, connecting with Ilica street through the building of the former First Croatian Savings Bank (Croatian: Prva hrvatska štedionica). It was designed by architect Josip Vancaš and built as part of the savings bank building between 1898 and 1900. The structure consists of two passageways connecting a middle octagonal atrium (lending the passageway its name) to the city streets.