Southern Bottle tree - Don Drane
They originated in Africa (and before that I think) but are very popular in the south (Louisianna, Mississippi, etc.). The belief is that if you hang or have these beautiful bottles, evil spirits will stay away from your house.
I can't find the link, but many Asian and Indian cultures have something similar that they call spririt poles or trees. They're pretty cool (something to do with those Skye Vodka bottles!)
