Hohen Solon Bridge, basically after going to Cologne Cathedral, can walk here, across the Rhine River, most of the couples come back here to hang a love lock on the railings of the bridge, and then throw the key into the Rhine River, love can last forever, so many locals and tourists who come to admire the name of their lover engraved on the bridge, accumulate day by day. Monthly fatigue, more and more locks, colorful copper locks, forming a unique landscape.