The Hohenzollern Bridge was built in 1911. For lovers who are immersed in love, the Hohenzollern Bridge is more attractive to them as a romantic bridge of love. This love bridge in Cologne erects a barbed wire wall between the railway bridge and the sidewalk. This is where the lovers padlock. The first lock on the love bridge was born in the late summer of 2008. After a pair of lovers hanged the lock, they threw the keys into the Rhine under the bridge. After that, the lovers here have followed suit, and there are already about 160,000 locks on the bridge. It is said that Cologne's Love Bridge is the bridge with the most traffic passing through Europe. Driving 1200 trains a day allows more people to witness love.