Some useful websites:
Large scale structure of the universe:
http://cfa-www.harvard.edu/~huchra/zcat/
http://www.damtp.cam.ac.uk/user/gr/public/gal_lss.html
Milky Way
http://adc.gsfc.nasa.gov/mw/mmw_allsky.html
http://adc.gsfc.nasa.gov/mw/milkyway.html and further links
http://www.seds.org/messier/more/mw.html
http://www.damtp.cam.ac.uk/user/gr/public/gal_milky.html
Local Supercluster
http://www.anzwers.org/free/universe/virgo.html
http://www.seds.org/Maps/Stars_en/Fig/virgo.html
http://www.seds.org/messier/more/virgo.html
http://www.wikipedia.org/wiki/Virgo_Supercluster
Radio Astronomy:
http://www.nrao.edu/
http://www.ncra.tifr.res.in/