Cruise ships represent represent a luxurious vacation away from everyday life, where voyagers can enjoy extravagant amenities aboard massive, floating resorts on the seas. And cruise lines are going bigger: currently, there are more than 50 cruise ships with a gross tonnage exceeding 100,000.

But cruise ships are also getting "smarter." In 2014, Royal Caribbean International launched Quantum of the Seas, a ship packed with so many high-tech amenities (robot bartenders, virtual balconies in windowless rooms) that it was

Many cruise ships now on-board activities and perks that could rival the most luxurious resorts on the ground. 's Freedom of the Seas features a FlowRider surf simulator, rock climbing wall, ice-skating rink, Royal Promenade, cantilevered whirlpools, mini golf course, H2O Zone water park.

Want to experience the Great White Way on the seas? 's Norwegian Breakaway, the largest cruise ship ever to home port year-round in New York City, offers three live Browdway performances. It also showcases comedy, jazz & blues club, dueling piano bar.

The 10 largest cruise ships, ranked by gross tonnage:

Allure of the Seas (2010):225,282 gross tonnage; 5,412 passengers

Oasis of the Seas (2009):225,282 gross tonnage; 5,412 passengers

Quantum of the Seas (2014): 168,666 gross tonnage; 4,180 passengers

Norwegian Epic (2010): 155,873 gross tonnage; 4,100 passengers

Freedom of the Seas (2006): 154,407 gross tonnage; 3,634 passengers

Liberty of the Seas (2007):154,407 gross tonnage; 3,634 passengers

Independence of the Seas (2008):154,407 gross tonnage; 3,634 passengers

Queen Mary 2 (2004): 148,528 gross tonnage; 2,592 passengers

Norwegian Breakaway (2013): 146,600 gross tonnage; 3,988 passengers

Norwegian Getaway (2014): 145,655 gross tonnage; 3,910 passengers

View the slideshow above to explore the world's 10 mega-ships.

MORE ON WEATHER.COM: Vintage Photos of Luxury Liners

Sept. 1929: First-class passengers playing deck tennis aboard New Orient liner 'Orontes' during a cruise in the English Channel. (Puttnam /Topical Press Agency/Getty Images)