Some cruises redefine the word "luxury" by tailoring to the needs of elite travelers, needs like supersized suites, world-renowned cuisine and mandatory ocean-view rooms.

The world’s most exclusive and expensive cruises may be out of reach for most of us, but it doesn’t hurt to dream. Here are five of the most extravagant cruises designed for the rich and famous.

Seven Seas Explorer Cruises

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Regent Cruises’ Seven Seas Explorer was heralded as the world’s most luxurious cruise ship when the Princess of Monaco christened it in 2016.

And the ship certainly lives up to its name, offering major perks like free 24-hour room service, unlimited shore excursions and pre-paid gratuities. Guests on the Seven Seas Explorer can also enjoy Broadway-style shows, culinary demonstrations, wine tastings and free access to all specialty restaurants on board. Oh, and Explorer guests receive free round-trip Business Class flights to get them to their departure port and home from their last port of call.

Of all the Seven Seas Explorer cruises, the 76-Night Barcelona to Auckland is most suited for the rich and famous. With a price tag starting at $47,599 per person, the 76-night cruise takes travelers to a diverse mix of countries including Greece, Egypt, Israel, Jordan, Oman, India, Singapore, Indonesia, Australia and New Zealand. If you have that kind of cash and a desire for opulence, the next cruise departs on November 6, 2019, from Barcelona, Spain.

Scenic Eclipse Polar Cruises

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For 10 years Scenic Luxury Cruise and Tours has been offering small ship cruises in rivers throughout Europe, Russia and South East Asia. But this August the company debuts the first member of its new ocean fleet, the Scenic Eclipse, a six-star luxury discovery yacht designed with only the most elite travelers in mind.

The Scenic Eclipse will take guests to rugged, remote and unique polar regions that are rich with wildlife. One especially luxurious cruise, the Antarctica, South Georgia & Falkland Islands tour, will depart from Buenos Aires, Brazil, in December and spend 19 days taking 200 lucky guests to several breathtaking and awe-inspiring polar destinations before returning to Buenos Aires. And the Scenic Eclipse is specially designed to be able to navigate through narrow channels and tiny harbors so that it can take travelers to more remote and intimate locales than other cruise ships.

Everything about Scenic polar voyages screams luxury but the excursions are particularly over the top. Offerings include experiences on the Scenic Eclipse’s helicopters, submarine and Zodiacs. And the ship’s 16-person Specialist Discovery Team runs all excursions.

Oh, and as an added bonus, Scenic Explorer travelers don’t need to worry about packing bulky winter gear. Important items like parkas and special polar boots are provided — if you can handle the basic $24,266 per guest price tag, that is.

Silversea’s Finest World Tour

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Silversea is a leader in the world of all-inclusive, small ship luxury cruising, offering travelers voyages and expeditions to more than 900 destinations. And Silversea takes the term all-inclusive pretty seriously. Once on board, guests shouldn’t have to spend a penny on anything, including personal butler service.

All Silversea cruises are designed with rich and famous clientele in mind. But the Finest World Tour is the company’s most luxurious, and expensive, offering. With a starting price of $64,008 per guest, the Finest World Tour departs from Fort Lauderdale, Florida, and sails to 54 different ports in 34 countries over the course of 150 days before ending in New York. And those lucky few who take the voyage can take full advantage of world-class dining, bespoke excursions and expeditions, and a guest to crew ratio of 388 to 302 all while sailing on Silversea’s most elite ship, the Silver Whisper.

Six Star Cruises’ Million Pound Cruise

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British company Six Star Cruises crafts cruises that sail to nearly every part of the globe in some of the world’s most luxurious cruise ships, such as those owned and operated by Seabourn, Regent Seven Seas, Hapag-Lloyd, and Crystal Cruises. While every cruise Six Star offers is designed for elite travelers, the company’s Million Pound cruise is by far the most luxurious.

The specific details of Six Star’s Million Pound cruise change each year. For one sailing, those rich enough to afford the hefty price tag began their journey by being whisked away from their homes in a private helicopter stocked with champagne and beluga caviar. Guests were then flown to a local airport where they caught a private charter flight catered by a Michelin-star chef.

Once in Los Angeles, California, guests spent four days at the Beverly Wilshire before setting sail on a 124-day cruise to 28 countries. And while four months at sea may sound potentially suffocating, guests probably didn’t feel too claustrophobic in their 1,000-square-foot, two-bedroom, two-bathroom, two-veranda Royal Suites.

Queen Mary 2 Transatlantic Crossings

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The Queen Mary 2 is Cunard Cruise line’s flagship cruise ship and the company claims the ship is the world’s only true ocean liner. The Queen Mary 2, or QM2, as it is often called, is also one of the oldest luxury cruise ships still in service — it’s been transporting the rich and famous from New York, to Southampton, U.K., for at least 180 years.

Before flying was all the rage, the QM2 catered to celebrities like Aubrey Hepburn, Clark Gable, Frank Sinatra, Ginger Rogers, Rita Hayworth, Gregory Peck and Debbie Reynolds.  And these days celebrities like Sharon Stone, Twiggy, Meryl Streep and Mick Jagger have all been spotted on the QM2.

The QM2 got a refitting in 2016, so it’s looking spiffier than ever. And some of the new additions to the luxury liner include fancy dog kennels, the Clarendon Fine Art Gallery and even more spacious, fit-for-royalty suites and estate rooms.

So for those looking to take in a bit of history and pampering at the same time, a transatlantic crossing on the QM2 may be the ticket. A seven-day transatlantic crossing on the QM2 in the Princess Suite costs around $5,445.