TerraVision is a freely-available, cross-platform, and scalable system. TerraVision can browse huge datasets, in the order of terabytes. All data can be distributed over multiple servers across the Web. 3-D models can be overlaid using open standard formats VRML and GeoVRML, e.g. models for buildings, wind vectors, icons, etc. Datasets of different size, resolution, source, and coordinate system are supported. Finally, TerraVision is integrated with SRI’s .geo infrastructure to become a .geo browser. • What is .geo? .geo is essentially a discovery mechanism for any geospatial data across the Web. It allows TerraVision to automatically find all relevant data for a particular view and to stream this directly to the user’s display. See: http://www.dgeo.org/. • What is the history of TerraVision? TerraVision began life back in 1992. It was developed as the application to demonstrate the high-speed network capabilities of the DARPA-funded MAGIC project. Work continued through the subsequent