I know of no such resource available on the Internet, yet, but if you look at my page on Galaxy Clusters you will find some 2-D sketches of the major elements to the universe near the Milky Way, and out to several billion light years. These sketches are incomplete and give only a rough idea of the major collections of matter. Astronomers are still measuring distances to several thousand galaxies every year to build up an accurate model.
There are, also, several good books that have such figures. George Abell charted the locations of thousands of large clusters of galaxies as did Fritz Zwicky. Since the 1980's, most of this cartographic work is being done by Dr's. John Huchra and Margarite Geller at the Harvard- Smithsonian Center for Astrophysics in Cambridge, Massachusetts. Brent Tully has created computer-generated views of our Local Supercluster, and his book 'The Nearby Galaxies' is a detailed atlas of the locations of all major galaxies within 100 million light years of the Milky Way.
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