We are visiting Provence and Barcelona, and would love to take a detour and see the caves. We leave Provence on the 10th, and are due in Barcelona on the 11th. So far, I haven't been very successful finding easy train routes. The other option is to rent a car. Are we being crazy trying to fit this in? Should be just spend an extra day in either place and do the caves sometime in the future? Also, if we don't do the caves, is Carcassone worth the stop? Thanks.