Although most cruise reviewers say there are five, there are strictly speaking only two cruise lines that truly have a “ship-within-a-ship”. A fully self-contained world where passengers paying at least $500 per person a night for a suite are given the special entry card to a door that lets them step out of the regular cruise ship and into an exclusive VIP (Very Important Passenger) one. I have stayed on all 5 of them though and review and rank them. Become a Tips For Travellers Patron: https://www.patreon.com/tipsfortravellers and get exclusive Patron-only content, downloads and livestreams Visit my Tips For Travellers YouTube: https://www.youtube.com/tipsfortravellers