Hagia Sophia was inaugurated by the Emperor Justinian I as an Eastern Orthodox cathedral.
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Radio City Music Hall opened in New York City.
The 'Flushing Remonstrance' petition was signed in the Dutch colony of New Netherland, which protested the ban on Quaker worship.
Radiation from an explosion on the magnetar SGR 1806-20 reached Earth.
The Hawaiian Fire Department was established.
Twenty-nine nations came together to sign an agreement that created the International Monetary Fund.
