The NÃ 1\/4 rburgring , known as simply `` the Ring '' by enthusiasts , is the name of a famous motorsport race track in NÃ 1\/4 rburg , Germany , built in the 1920s around the village and medieval castle of NÃ 1\/4 rburg in the Eifel , which is about 70 kilometres south of Cologne , 100 kilometres northwest of Mainz , and 120 kilometres northwest of Frankfurt . The NÃ 1\/4 rburgring is a motorsport complex around the village of NÃ 1\/4 rburg , Germany . It features a modern Grand Prix race track built in 1984 , and a much longer old North loop track which was built in the 1920s around the village and medieval castle of NÃ 1\/4 rburg in the Eifel mountains .