City on a Hill is a period cop series about trying to change the system from within, and encountering resistance — sometimes deadly resistance — everywhere you turn. It's a bit like the 1973 biographical crime film Serpico, except set in '90s Boston instead of '70s New York, and starring Kevin Bacon in the Al Pacino role.
The three seasons of the series Deadwood, which ran on HBO from 2004 until 2006, were set in a mining town in the territory of the Dakotas — the black mining hills sung about by Paul McCartney in "Rocky Raccoon." There was no established law there in 1876, when the first season of Deadwood is set, but there was plenty of gold and silver, which led to a quickly growing community of miners, laborers, gamblers, prostitutes, opportunists and outlaws.