ARTstor is a non-profit digital library that provides more than one million images of cultural objects and architectural works covering a wide range of historical, political, social, economic, and cultural documentation from prehistory to the present. ARTstor collections enable a wide range of users -- curators, scholars, educators, librarians, and students -- to teach and study with images in an online environment optimized for exploring visual content in new and exciting ways. This session will highlight ARTstor collections and platform features, and will describe new directions including the Shared Shelf initiative. ARTstor has formed a community partnership to develop Shared Shelf -- an image cataloging and management system that will provide new capacity to build and share digital images for teaching and study.