The remains of the Castle can be visited
CastleChâteauneuf-du-Pape
Château de Châteauneuf-du-Pape

The Château de Châteauneuf-du-Pape dominates the village and its vineyards, since nearly 800 years. Its relationship with the papacy d'Avignon strongly marked Châteauneuf-du-Pape, and the viticulture of the region.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Hervé Rebours
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 44.0576, 4.8289