No, tickets cannot be bought on-site as there is no admission fee to view the exterior remains of Modern Wageningen Castle.
There is no ticket office or admission process for Modern Wageningen Castle's historical remains. Access to view the reconstructed foundations and information boards is open and free of charge. Therefore, purchasing tickets on-site is not applicable.
Any transactions on the premises would be with the integrated hotel or restaurant, 'Hotel de Wereld' or 'De Commanderie', for accommodation, food, or beverages. These are separate commercial entities and do not relate to an entrance fee for the historical site itself.