Ha'penny Bridge in Dublin

You're standing at the Ha'penny Bridge, Dublin's famous white footbridge over the River Liffey. Have a look at that graceful arch. It crosses the river in a single span, made entirely of cast iron. That iron wasn't cast here, though, but in Coalbrookdale in Shropshire, England. The ribs were made in eighteen sections and shipped over to Dublin. The ore itself was Irish, mined on Sliabh an Iarainn in County Leitrim.