The Corinth Canal was built in 1881-1893 by the same people who did the Suez canal.
The canal is 4 km long, and at one point cuts through cliffs 300ft tall.
There were earlier attempts to build a canal in 7th century BC, by the then ruler of the city of Corinth. Who abandoned the idea in favor of a overland road.
Then in 67AD, the Roman Emperor Nero began work on the canal, but only about 1/10 of the distance was dug before it was abandoned.
The current canal is to small for a cruise ship our size to pass through, although some smaller cruise ships still use it.
In WW2 the Germans when retreating from Greece used explosives to block the canal.
Sailing through the canal takes about 20 minutes, and gives some interesting views.
Also there is a place that you can bungee jump from one of the bridges.
We saw a group getting ready to jump, but they did not while we were sailing past.