The Corinth Canal in Greece is a remarkable feat of engineering that connects the Aegean Sea with the Ionian Sea, cutting through the narrow Isthmus of Corinth. Completed in 1893, this man-made waterway is approximately 6.4 kilometres (4 mi) long and only about 21 metres (69 ft) wide, making it one of the most difficult navigation routes for modern ships. The canal dramatically reduces ships' travel time by avoiding the long journey around the Peloponnese peninsula. Carved through sheer limestone walls that rise up to 90 metres (295 ft) high, the Corinth Canal is not only an important maritime passage but also a popular tourist attraction, offering spectacular views and thrilling experiences such as bungee jumping. 
Discussion
Before that there was the option to drag the ship through the narrow piece of land. So since sailors whete there constantly, whorehouses where there also. Even after the passage was created, sailors continued for a while to drag the ships because of the whorehouses. Even today in Greece we use the phrase "a pussy can drag a ship"...
There is also a very cool ‘sinking bridge’ you drive over to cross the canal in one spot. Think opposite of a lift bridge - it submerges out of ships’ way.