The legendary racetrack was built between 1925 and 1927 by roughly three thousand workers near the Eifel mountain range in the west of Germany. The track, 20.832 kilometres long, incorporates 73 turns, 33 of which are left turns and 40 are right turns. The difference in elevation between the lowest and highest points on the track is approximately 300 metres. Formula One Champion Sir Jackie Stewart dubbed it the “Green Hell”. The circuit is used by carmakers for tests, and is also open to the general public and their cars.