Open Question: How to make a fire pit?

How to make a fire pit? Me and my friends are going to camp next weeks, and we don't know much about camping. We haven't decided camping location, in my backyard or look for camp site. We have plan to make bonfire. How to make fire pit in easy way?

Source:
http://answers.yahoo.com/question/index?qid=20110921001616AADElOK

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