Is there an entrance fee

Yes there is for the inside tour but not for the small grounds.

No fee for outside if like to see inside the castle it's $18 per adult

They do offer senior and military discounts don't forget to ask

Yes 18.00 for adults

Yes

There is an entrance fee for a tour of the interior housing all the museum exhibits....but you have free access to the gift shop and most of the picturesque exterior and grounds..

Yes there's an entrance fee of $18 and that's the same price for the guided tour or if you just take the self guided tour.