Strange-looking flower...what is it??

So I found a whole vine of these odd-looking flowers at this old field with a paved loop where my BF and I (and half the rest of the town) walk in the evenings. The field used to have houses, so I imagine it's left over from an old garden. There's no way it's native to the area.
Has anyone ever seen a flower like this??

It's a purple passion flower!! Check out the link. Very pretty!

http://www.easywildflowers.com/quality/pas.incar.htm

Yes, it is a passion flower! I'd get a start of it if I were you.

Looks like Passionflower, someone had a butterfly or hummingbird garden

WOw how beautiful!

I'll be darned; apparently they ARE native to the area! I'm surprized I've never seen one growing wild.

Ever never seen one either..it is very beautiful though!

I didn't know passion flowers were able to grow in "the wild" either. I try to get some cuttings going. PM me for propagation help!!

Wow, that's a beautiful flower!