Twistory is a history browser that displays lifetimes and travels of historical figures, dates, and locations of historical events. It is a tool for keeping track of when and where things happened, and their relationships to each other. It is meant to provide a way to keep track of the multitude of different peoples, dynasties, empires and developments throughout history. It answers questions like, "What else was happening in the world at that time?" and "Did A live at the same time as B, or before?" A resource of over 1600 people, events and places is included. The database has an open text format, so that more historical information can be added by any user. A complete description of the file format is included. The two main windows are the time-line window, which shows lives and events against a variable time scale, and the map window, which shows people and events in their geographic locations during an interval of time.