There is a fee to visit the Citadel and museum, parkink is free but only if you do go inside to visit the Citadel, the price is quite reasonable and it's worth every penny you spend. Make sure you have at lest 3 to 4 hours the complete the visit but believe me there is not a dull moment, yoy will enjoy every second of the visit, also make sure you have a camera with you, you will want souvenirs of that visit. The rest of the park, outside the walls is free and accessable to evryone. ENJOY.

When we were there, a lot of people just parked on the side of the road "L'Avenue George VI". It may have been illegal but there were so many cars I don't think they were afraid of getting ticketed. We parked for free on Rue D'Auteuil. There is a parking area between the Rue Dauphiné and the Rue Saint Louis, on the other side of the street from the Hotel Manoir d'Auteuil. It is a very short walk to the Batterfields Parc.

Yo no pague entrada fui allí con el city tour pero no vi que en ningún lugar pidieran entrada

Hi sorry - I meant the Upper Town! Hope you enjoy.