The Hohenzollern Bridge in Cologne is a pedestrian and train bridge offering stunning views of the Cologne Cathedral and the Rhine River. It's famous for the 'love locks' attached to its fences by couples. The bridge is generally accessible to all, but those with mobility issues should be aware of potential crowds and uneven surfaces on the approaches. Visiting solo is perfectly safe and common, allowing for independent exploration and photography. Guided tours focusing on the bridge's history and the love lock phenomenon are also available. There are no seasonal restrictions, though the bridge can be crowded during peak tourist times. Walking across the bridge is free; costs would only be associated with transportation to the bridge and any desired tours or souvenirs. A typical visit lasts about 30 minutes to an hour, depending on how much time you spend admiring the views and the locks.