It's a railgun designed by German company Krupp, manufacturer of Ammunition and armaments who developed it in 1930. The railgun name is: Schwerer Gustav
Rest of the information can be read here:
80 cm Gustav Railway Gun | World War II DatabaseDora:RailgunSchwerer Gustav
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i saw that thing on discovery channel was too big it was the biggest cannon made by Germans and it could be only transported by rail ways scraped on conditon where there is war and no rilways then isko dakhoo aur hansoo
TB,The picture you have posted is a photoshopped version of the one below.Which is indeed the Schwerer Gustav.
now thats some thing interesting
nice