As mentioned above, Boston ivy belongs to the genus Parthenocissus, which means it is closely related to the Virginia creeper, P. quinquefolia. I live in an end-of-terrace house, and my neighbour has a Virginia creeper on her side of the fence. Left unchecked for just one year, that plant covered the entire back of my house (and halfway round the far side), sent long tendrils under the roof and most of the way across my loft, and covered the whole 40ft length of the dividing fence and halfway along the back fence. :eek:
It’s very pretty in autumn when the leaves turn bright red, but it is ridiculously vigorous.
I believe this is the same plant, having eaten one of my favourite pubs. (Actually, this pub is only about 70 miles from my house, so it may well be the same specimen 
)