We're not quite sure

Neither Katie, Carrie, or I could figure out what this is. We found it at Merkur (a large grocery store here in Vienna). We have come to the conclusion that it is in the pumpkin/squash/gourd family. It is very interesting and huge! We think it was about three feet long and it kind of resembles a huge zucchini on the outside and a pumpkin on the inside.