We present a novel system and methodology for browsing and exploring topics and concepts within a document collection. The process begins with the generation of multiple taxonomies from the document collections, each having a unique theme. These taxonomies then become an integral tool in the exploration of the document collection. To explore these multiple taxonomies we have developed the MindMap interface. Starting from an initial keyword query, the MindMap first presents the user with related terms and high level topics in a radial graph. One of the related high level concepts can be selected for further investigation. The MindMap uses a novel binary tree interface to explore the composition of a concept based on the presence or absence of terms. Individual documents are presented as spatial coordinates where distance between points relates to document similarity. Finally, selected documents are displayed and the user is allowed to further interact and investigate.