Based at the University of Colorado Boulder, the Interactive Geology Project offers visitors dozens of fascinating 3D animated videos that "illustrate basic principles of geology in entertaining and accessible ways." Several videos are highlighted on the main page, and the Video Library provides access to all of the project's content. This includes A Brief History of Colorado Through Time, a 25-minute movie showing Colorado's geologic evolution over the past 540 million years, as well as short clips showing (for example) cross-sections of various igneous intrusions and the geologic history of erosion along Colorado's Front Range. The most recent addition (as of this write-up) is a seven-minute video demonstrating their first foray into virtual reality, depicting what is now the city of Boulder at three different times near the end of the Cretaceous period. While the project's videos focus on locations in Colorado, they will be of interest to anyone curious about geologic history, and many are well-suited for classroom use. The Interactive Geology Project was founded in 2002 by Paul Weimer, a professor of geological sciences and the director of CU Boulder's Energy and Minerals Applied Research Center, and it has had an ongoing collaboration with the Denver Museum of Nature and Science since 2013.