Castel Nuovo, also known as Maschio Angioino, is a medieval castle in Naples, that's totally worth checking out. Built in 1279, this bad boy has seen kings, queens, and even popes come and go. It's got a cool civic museum inside with stuff like the Palatine Chapel and museum paths on different floors. Plus, it's the headquarters of the Neapolitan Society of Homeland History. So, if you're into history, art, or just want to feel like royalty for a day, Castel Nuovo is the place to be!