TERMS OF SALES : Tickets must imperatively be kept throughout their period of validity Spot checks can be performed on vehicles Lost or stolen tickets will not be replaced Tickets are not refundable Any resale or reuse ticket constitutes fraud and, as such, is subject to prosecution A place on the top floor can not be guaranteed The organizer can not guarantee the return of personal effects and luggage left behind or forgotten in vehicles, and it can not be held responsible for their failure to return The organizer reserves the right to cancel or modify certain tours without notice if the comfort or safety of travelers demanded it, and in case of strike or demonstration Prices, times and duration of the tour may change