Diolkos was a specially constructed road paved with slabs of stone, traversing the Isthmus of Corinth. During ancient times ships were dragged on this road from the Corinthian Gulf to Saronic Gulf and vice versa. The width of the road ranged from 3.5 to 5 meters, while there were 2 “grooves” serving as rails. It was possibly constructed at the beginning of 6th century B.C. by tyrant Periandros.