Corinth Canal by boat with optional transfers

Sliced through solid rock, the Corinth Canal is one of Greece's most important engineering achievements. And you'll have the pleasure of cruising along this narrow sea corridor on this half-day tour – it's the perfect backdrop for snapping up those Insta-gold photos. If you've opted for the version of the tour that includes transfers, you'll be pick-up from your hotel and begin cruising towards the Corinth Canal. It's a 6km-long passage that connects the Gulf of Corinth and the Saronic Gulf in the Aegean Sea, but what's really astounding is its narrowness – just under 25m wide – and history.As your captain expertly manoeuvres the boat with only a couple of metres either side of near-vertical cliffs, you'll be able to appreciate this engineering marvel. Your guide will fill you in on how excavation first started under the rule of Roman Emperor Nero in the first century AD and was finally completed by the French in the 19th century.