Place of Iniquity is a term used to describe a location where immoral or unethical activities take place. The crossword solution for this term is DEN, which is a small, secluded room or area used for shelter or privacy. It is often associated with animals, such as foxes and wolves, who use dens to hide from predators and raise their young. In a figurative sense, it can also be used to refer to a place where people go to hide from the public eye and engage in illicit activities.