The phrase "den of vice" is an idiomatic expression that is used in written English and is entirely correct.
It refers to a place of moral depravity, or a place that is associated with and encourages sin or corruption. For example, you could say, "That seedy bar in town is a known den of vice, and it's best to avoid it."
Hence the description on jihadi websites of the Tunisian hotel complex as a "den of vice".
We are then led through Pottersville, as this alternative town is called – a nightmarish den of vice and depravity, full of stumbling people, blaring sirens and flashing neon.
Lez Brotherston's designs transform the Linbury into a den of vice, the band and their heroic conductor, Richard Bernas, sunk into a blood-red pit.
"Lust" is the third book in a series on the seven "deadly sins" which began life as a course by seven lecturers at the New York Public Library, that well-known den of vice.
Syria is hardly a den of vice, but it is an avowedly secular country where most women walk around without veils and various sects of Islam and Christians live in tolerance.
The Jacobins and the German Romantics may have been Rousseau's most famous and influential disciples, but Rousseau's claim that the metropolis was a den of vice and that virtue resided in ordinary people makes for a perpetually renewable challenge — from the right and the left — to our imperfect political and economic arrangements.
"Yes, opium dens, dens of vice and criminals' hang-outs, Mother.
But these dens of vice are not just good for those who work in them.
For months, these women had been calling for the establishment of full Sharia law and the closing down of all "dens of vice".
Ten years later trailer parks had become "dens of vice and corruption", in the phrase of the then FBI director, J. Edgar Hoover.
"Here, there are no dens of vice that attract a bad element," said Dmitri Rakovshchik," a resident and vice president of a Russian insurance company.
