Liffey River in Dublin crosses the city centre. The river is not wide and the flow is calm. It is not as beautiful and romantic as the Thames River in London and the Seine River in Paris. Lifei River is peaceful and simple, which also witnesses Dublin's history, development and cultural heritage. According to information, the Lifei River is 80 kilometers long, flows through mountains and rivers, and enters a section of Dublin which has been canalized. There is a boating race on the Liffey River in summer. There are many bridges on the Lifei River. There are special walking bridges - Half Penny bridges. They are small and delicate. The most historic one is the O'Cornell Bridge, which was built in 1794 and has a sense of historical vicissitudes. The sculpture of O'Cornell, the national hero, stands at the bridge head. There is also a bridge running trains, not far from the customs building. The main attractions of Dublin are on both sides of the Liffey River, Bar Street, Trinity College, St. Patrick's Cathedral in Dublin, Dublin Castle, old post office, pedestrian street, light pillar and so on. Scenic spots are concentrated, just walk.