The tour is unexpectedly interesting

Next, Wilson showed us (well, just me by now) the stone plaque commemorating the building of the original bridge in 1617.

'After more than 200 years, they knocked the old, stone bridge down and built a new one out of iron, just like the iron bridge at Ironbridge!' he enthused, 'But better!'

He pointed to another plaque, dated 1858, which marked the building of the new bridge. 

'So this is the 1858 bridge?' I asked. 

'Um, not exactly,' W replied, 'there was a bit of an accident and that one fell down,' he confessed.