This is one of those pieces of infrastructure that feels almost absurd when you first see it. There are two waterways crossing each other on two different heights. Here, the Mittelland Canal is carried over the Weser on a giant canal bridge, so ships pass above a river instead of meeting it at the same level. That is what makes the place so fun on foot or by bike. The original canal bridge opened in 1914, and since 1998 a newer parallel bridge has taken over most commercial shipping, while the old one remains the more atmospheric route for visitors. People fishing, having a picnic and riding …