High Quality Content by WIKIPEDIA articles! The Sweet Track is an ancient causeway in the Somerset Levels, England. It was built in 3807 or 3806 BC and has been claimed to be the oldest road in the world. It was the oldest timber trackway discovered in Northern Europe until the 2009 discovery of a 6,000 year-old trackway in Belmarsh Prison. It is now known that the Sweet Track was largely built over the course of an earlier structure, the Post Track.