My mom and I are planning to visit Bouillon on a three-week Benelux trip this summer. The main thing we want to see there is the castle. We are interested in taking the torchlight tour at night, which I've been advised to book in advance, but I'm not sure where to go to do this... a link to the website to do so (preferably in English if a available) would be greatly appreciated if anyone knows it.
Also, is it free to explore the castle during the day? Or can it only be seen by a paid tour? Ideally we'd like to just explore it on our own during the day and not with a tour. Is this possible (even for a cost)?