Zone 7. Growing in a neglected area. It looks it needs support, but nevertheless 8 ft high. Habit is just a huge pile of branches and leaves. It looks invasive to me. Didn't notice any bee, didn't sense any fragrance. Flowers 1in diameter.
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It's a Clematis, Clematis vitalba. It's the one that pops up in hedgerows and the like quite naturally without anyone ever planting it. It has the common name of Traveller's Joy, supposedly because travellers on the road in summer would come across it and be pleased to see it. Also sometimes known as Old Man's Beard, so named for its fluffy seedheads. It usually scrambles over or up anything nearby, but if there's nothing for it to cling to, it makes a heap, clinging to bits of itself instead. It seeds prolifically (the seed heads are quite attractive) and the seed is spread by the wind, which is why it manages to pop up unbidden, more info here https://en.m.wikipedia.org/wiki/Clematis_vitalba