Greece's Most Underrated Site Is a 2,500-year-old Monument Most Tourists Don't See - but This Cruise Line Takes You There
Briefly

The amazing thing is just how narrow the canal is, and that [our ship] is really the capacity of what it can take. All the big ships have to go around it.
Having a way to pass through the Peloponnese peninsula would have been a huge time and expense saver 'back in the day when they had to rely on sails or on manpower to actually row a vessel.'
Read at Travel + Leisure
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