There is an interesting adverse possession case going on in my home city of Philadelphia, where a resident is trying to claim he owns a lot that the City says it owns. The lower courts ruled for the guy, and I believe it's at the PA Supreme Court now.
Some random links about it: https://www.inquirer.com/philly/news/fishtown-family-fights-philly-over-vacant-lot-20171016.html
Some random links about it: https://www.inquirer.com/philly/news/fishtown-family-fights-philly-over-vacant-lot-20171016.html