https://www.icastelli.net/en/castello-orsini-hotel-nerola

https://www.openstreetmap.org/way/391606440 Street view: https://goo.gl/maps/ingGtXmvtAFcz2VP8

Apparently this castle is a hotel now. Link above shows booking details.

A castle at the site likely dates to the 10th century, but documentation places the castle in the hands of the Orsini family by 1235. In that century, the outline of the castle, with merlonated walls, a moat, and towers was built. Ultimately, the castle would be sold in 1728 to Cornelia Barberini and Giulio Cesare Colonna. It was used as shelter by the Garibaldini in the 1867 attack on Rome.