Virtual reconstructions is all the new rage - just look at us! - but Antonio and Joseba Becerro Martinez laid their first virtual bricks (or meshes) as early as 2006. By now they have created a high-quality reconstruction of the entire Acropolis.
The most remarkable fact though, is that they did this using only OpenSource software and that Antonia and Joseba share their work with the rest of the world under a Creative Commons license, basically allowing you to copy, distribute, commercialize and to even make derived works under the condition you give them their - deserved! - attribution.
Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).