Google Sky lets you tour Chandra images online. Just like in Google Maps you can pan, zoom and search. Take a tour of the Chandra layers and try adjusting the transparency to see how the images fit into the optical map underneath. View such famous objects as the Sombrero galaxy, the Eagle Nebula, Eta Carinae and the Crab Nebula in X-ray and optical light.
Along with the Hubble Space Telescope and Spitzer Space Telescope, the Chandra X-ray Observatory has performed remarkably as one of NASA's "Great Observatories."