Cesspool is a pit or cistern, built to collect the sewage or other sediments from a house. It is commonly used to describe any filthy or immoral place.
The problem is most Americans agree with Bolton that the U.N. is a cesspool of its own crapulence, stealing American tax dollars intended for global do-goodery while working against American interests. (LA Times)
The establishment of the appropriate democratic structures would have proved to the world the PA’s capacity to govern and provide basic services to its people. Instead, Gaza continued to be a cesspool of terrorism, including reports of infiltration by al-Qaida, increased smuggling of weapons and the continuous launching of rockets into population centers in southern Israel. (Houston Chronicle)