This book combines current research in open data practices in the heritage sector with technical step-by-step guides on how to work with heritage data for visualisation, mapping, and mining. The book begins with an overview of the extent of open heritage data, a thorough review of the current literature and original case studies from practitioners at Europeana, the Digital Public Library of America, fx. Rijksmuseum, the National Gallery of Denmark and the Metropolitan Museum of Art. The second part of the book puts the theory into practice with a series of step-by-step guides that take the reader through creating, publishing, using and reusing open heritage data. The book covers: copyright and licensing for digitised and born-digital heritage material publishing different data types as open data (images, maps, structured data) finding open data with a guide to using APIs visualizing open data mapping open data mining open data the use of open data with examples of how to reuse, remix, hack and mashup open data.