Genesis 4:17

"And Cain knew his wife, and she conceived and bare Enoch: he builded a city and called the name of the city, after the name of his son, Enoch."

"He builded a city ..." according to Aalders, should be translated "He was building a city."[22] There is no record of his having completed the city mentioned here. The fanciful notion that Cain built some magnificent metropolis should be summarily rejected. The city that he built, or was trying to build, was probably nothing more than a stronghold base of operations for his depredations. There were evidently many people on earth at that time, placing this event centuries, perhaps, after the expulsion from Eden. (See under Genesis 4:3.)