Well, maybe not Bradford itself, but there are two rather impressive brick viaducts on the edges of the city, and I suspect I might be booking a day trip up to the city in the summer with my bike and touring the area. It seems to be about 3 hours from London, so a there/back in one day is just about manageable.
A list of other viaducts worth visiting on the Yep Sport blog.
Photos via: Geograph
I quite like viaducts, although the only decent one in London seems to be the one by Mill Hill East tube station – the Dollis Brook Viaduct.