The birthplace of industry! And its not too bad a place to visit too. With plenty of museums (although you have to pay) to visit and walking trails through the gorge and the surrounding greenery you can definitely make a day of this. Make sure you turn up early though as it is a nightmare to traverse the steep narrow roads whilst trying to find a parking space.
Set in a quaint town/village (although its hard to believe this place exists right next to the M54) Iron Bridge has all the niceties you expect from small tea shops, hand made toy stores and useless garden ornaments! You might just forget that the bridge itself is pretty impressive. Do yourself a favour, take a picnic and make a day of it by getting lost in the woodland.