In 1640 the poet Constantijn Huygens (1596-1687) wrote 150 short poems in Latin about the streets and buildings of his beloved birthplace The Hague. The volume’s title is ‘Haga vocalis’ which means ‘Voices of The Hague’. The Huygens app for iphone lets you discover the world of Constantijn Huygens. Walking the streets of The Hague is like roaming around a museum filled with wonderful monuments and artefacts of all centuries. ‘Voice of The Hague’ is also available in a book ‘Stemmen van Den Haag’. This app is an initiative from the Academic Frans Blom and poet Ilja Leonard Pfeijffer. Frans Blom works at the University of Amsterdam and is a Golden Age  and Huygens specialist. Ilja Leonard Pfeijffer is a poet, novelist and a publicist. Voices of The Hague has been made possible by Haags Historisch Museum, Haags Gemeentearchief and Koninklijke Bibliotheek and financially supported by Fonds Publiekparticipatie of the municipality of The Hague. Constantijn Huygens (1596-1687) is one of our major poets and father of the famous scientist Christiaan Huygens. An exhibition dedicated to these two geniuses is shown (24 April – 28 August) in de Grote Kerk in the centre of The Hague.