A subterranean prison complex, meant to incarcerate those who need to be removed from society.
You are sailing along the sea when you see a lighthouse in the deep blue middle. It is a lone light house, built on a rock not much larger than the tower itself. It is an oddity.
Cheza Betaze is the 17th Nekron urban area found in the Northern Cascades. The reasons why it is the best known of all Nekron cavern cities is that is has an easily accessible surface entrance/ exit which is just off the main Cascade trade trails. Being of recent construction in a time of prosperity, it is a city the Nekron feel proud off.
Pirates' many bejeweled rings and piercings actually had a practical purpose - when the pirate or sailor died, the rings could be taken off as payment for a proper burial, saving him from a watery grave. This could be tied into regional culture, or made into a quest (The Pirate's Lost Rings, etc.). Also gives treasure-seeking divers another thing to look for besides crusty old chests.