I went to see it when I was a child and was disappointed. Not much is left of it.
There is an interesting story about it too. In the Byzantine era, a Greek admiral was hunting a Saracen fleet that raided the Aegean. However they learnt that they had tricked them and had left the Aegean passing around the Peloponnese and besieging Patra. So he remembered the Diolkos and had his men and the locals clear it and passed the fleet over it. Needless to say that the Saracens were destroyed since they didn't expect anyone to come, especially from that direction.
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