Diolkos
I didn't know that this was unique to Greece, I always thought that it would have happened in other similar parts of the world.fun fact (that I NEVER expected to explain in english! ):
there is an expression in Greek which says "pussy can pull boats". Obviously there were prostitute services along the "diodos" as is commonly found in harbors and the "joke" behind this expression was that sailors preferred the hard work of pulling the boat on land and having a chance to meet women than sailing in the sea around peloponisos.