Aquariums are fascinating, but keeping one of your own can be a lot of hard work. Most people start small with a simple 10 gallon aquarium that has a few goldfish, a plastic plant or two, and colorful rocks. The aquariums in this list, however, are anything but simple. These are the 25 most extreme aquariums in the world.

25 Takashi Amano, Aquascaping #1 The first five places on this list must go to Takashi Amano. He is a photographer, designer and a pioneer in aquascaping. 24 Takashi Amano, Aquascaping #2 23 Takashi Amano, Aquascaping #3 22 Takashi Amano, Aquascaping #4 21 Takashi Amano, Aquascaping #5 20 The Labyrinth Aquarium The Labyrinth Aquarium is the gerbil cage of aquariums. 19 Jellyfish Aquarium This Jellyfish Aquarium made the list not because of the aquarium, but because keeping jellyfish as a pet is extreme. Jellyfish are fragile so the aquariums must be designed with special care to keep them from being killed by the filtration. This aquarium is an awesome 2011 kickstarter project. 18 The Fish Highway aquatic-eden.com The Fish Highway allows fish to travel from one tank to another across an entire room. 17 Fish N’ Flush Subscribe to List25 The Fish N’ Flush is a kit to replace your toilet bowl with a fish bowl. The company that originally designed the Fish N’ Flush only made 2,000 so if you want one you’ll have to get lucky on eBay. 16 Car Aquarium unp.me The Car Aquarium is an exhibit at Siam Ocean World in Bangkok. 15 Pieter van Suijlekom’s Reef Aquarium reefkeeping.com Pieter van Suijlekom’s reef aquarium won Tank of the Month in February 2006. 14 Zero Edge Aquarium zeroedgeaquarium.com Zero Edge aquariums have no lid on them. Instead the water overflows into a special basin that filters and recycles the water from the bottom. With no visible hoses or filtration equipment, this aquarium is the closest you can come to snorkeling in your living room. 13 David Saxby’s Aquarium David Saxby’s Aquarium Subscribe to List25 David Saxby’s tank is famous among aquarists. His tank has been featured in magazines and on television and it is easy to see why. 12 The Infinity Aquarium Subscribe to List25 This aquarium brings a new meaning to the phrase swimming around in circles. 11 Spacearium Hanging Aquarium spacearium.net/ The Spacearium is a hanging aquarium that comes in 55 gallon up to 75 gallon sizes. 10 Aquarium Coffee Table opulentitems.com Another aquarium from opulent items. This is a great aquarium if space is limited or you are just looking for a good conversation starter. 9 Fish Tank Bird Cage home-designing.com This bird cage is surrounded on all sides by a fish tank. 8 World’s Smallest Aquarium dailymail.co.uk Created by Russian artist Anatoly Konenko, this tank only holds 10ml of water. 7 AquaDom in the Radisson Blu Hotel, Berlin uniquedaily.com The AquaDom is located inside the Radisson Blu Hotel in Berlin, Germany. The center of this 1 million gallon aquatic cylinder contains a glass elevator allowing visitors 360 degrees of fish viewing. 6 Hotel Atlantis in Dubai, United Arab Emirates flashydubai.com This hotel allows you to sleep with the fish and live to tell about it. 5 The Reverse Aquarium – Poseidon Resort in Fiji mouille.wordpress.com The rooms for this hotel will be located completely underwater. Essentially, by staying here, you’ll be in the aquarium. 4 Monterey Bay Aquarium wikipedia.com Located in Monterey, California, the Monterey Bay Aquarium contains one of the largest single-paned windows on its 1.2 million gallon aquarium. 3 L’Oceanogràfic, in Valencia, Spain aerismaud Valencia is home to the largest aquarium in Europe holding 1.85 million gallons and over 45,000 marine creatures. 2 The World’s Largest Aquarium – Georgia Aquarium Subscribe to List25 The world’s largest aquarium is located in Alanta, Georgia. This one aquarium holds six million gallons and is one of the few aquariums in the world capable of housing whale sharks and manta rays. 1 Kuroshio Sea at the Okinawa Churaumi Aquarium Subscribe to List25 This aquarium is only the second largest aquarium in the world, but the video is by far the best video of an aquarium on YouTube with nearly 9 millions views. SEE ALSO: 25 Most Visited Countries In The World » NOW WATCH: 25 Awesome Movies You Probably Haven't Seen Subscribe to List25