As cruise ships continue to get larger and packed with more unique features, the price tag to build these massive vessels goes up. There are seven ships currently on the waters that all topped one billion dollars in construction costs. Do you know which ones they are? Here is a look at the most expensive cruise ships ever built.

Royal Caribbean Allure of the Seas

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Royal Caribbean takes the top spot with an overall cost of $1.5 billion to build Allure of the Seas. This ship debuted in 2010 and can hold up to 5,400 passengers. At the time of its construction, it was also the largest ship in the world as well, just literally inching out Oasis of the Seas. Allure of the Seas was the first ship to feature an on-board Starbucks, and it also has an ice-skating rink and theater that can hold nearly 1,400 people.

Royal Caribbean Oasis of the Seas

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Royal Caribbean holds the second spot as well with Oasis of the Seas, carrying a price tag of close to $1.4 billion to build. It’s only slightly cheaper than Allure of the Seas, primarily because it was the first ship in this new class. It started sailing in 2009 and can also hold 5,400 passengers. Like its sister ships, Oasis of the Seas has a dizzying array of things to do, including a theme park, miniature golf, a sports zone and an entertainment center.

Royal Caribbean Symphony of the Seas

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Royal Caribbean’s Symphony of the Seas has set several records in its short existence, including being the biggest cruise ship ever built. It also ranks as one of the most expensive ships to build in the world, at $1.35 billion. If you want to book the most expensive suite, the Ultimate Family Suite is a multi-level cabin that covers 1,346 square feet. This one-of-a-kind experience includes an air hockey table, ping pong table and even a slide for you to get from the top floor to the bottom floor. There is also a whirlpool hot tub on the balcony that offers unobstructed views.

Royal Caribbean Harmony of the Seas

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Royal Caribbean rounds out the top four most expensive cruise ships with Harmony of the Seas, which ties the Symphony of the Seas at $1.35 billion in construction costs. Harmony of the Seas is one of Royal Caribbean’s newest ships, debuting in May 2016. At the time, it was the largest ship in the world, but it was slightly cheaper to build as they learned how to better manage costs with this third ship in the Oasis Class. At the time of launch, Harmony of the Seas had the tallest waterslide at sea and plenty of new experiences and features throughout the ship.

Norwegian Epic

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One of the only non-Royal Caribbean ships on the list is the Norwegian Epic, which debuted in 2010 and costs $1.2 billion. It features a large Aqua Park and is desirable for many travelers due to the availability of single passenger cabins. Norwegian Epic represents the newer generation of Freestyle cruising and is in line with the “mega-class” ships from Carnival and Royal Caribbean.

Norwegian Bliss

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Norwegian Bliss launched in 2018 and is Norwegian Cruise Line’s latest ship to top one billion dollars in construction costs. It debuted to much fanfare, with guests raving about the wide variety of amenities and experiences on board, including a go-kart track. There is also a laser tag area and mini bowling alley. The ship can hold around 4,000 passengers, with 82 studio rooms available for solo travelers.

Royal Caribbean Ovation of the Seas

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The last ship on the list is Ovation of the Seas, which debuted in 2016 and can hold nearly 4,200 passengers. This was the third Quantum-class ship in the fleet and offers innovative features like North Star, the jewel-shaped observation capsule located 90 meters above the deck where passengers can enjoy 360-degree views. There is a sky diving simulator, basketball court, bumper car rides, an indoor pool with retractable roof, kids’ water park and even a 30-foot-high rock-climbing wall. When it debuted, it took the record for largest cruise ship to be based in Australia.